Malicious PDF — malware analysis report

Static analysis result for SHA-256 9443d576869ef3a9…

MALICIOUS

PDF

129.2 KB Created: 2021-04-21 13:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6156b2b1d49fa34daaa21a36e4bf05b7 SHA-1: ab032a6816804eb981cf96f9f92a05f1f08e1a90 SHA-256: 9443d576869ef3a91671b5dcfb6e04671b774739c299b2836911ec797525a530
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF sample was flagged by multiple heuristics as a link farm, containing numerous external links to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farm indicators suggests the document is designed to redirect users to phishing pages or download further malware, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/strik?utm_term=what+is+indian+culture+in+hindi PDF link annotation
    • https://cdn.sqhk.co/nozelenid/dK9ujgo/wuvumiwegevofusas.pdfIn PDF document text
    • https://ranalugepileli.weebly.com/uploads/1/3/4/7/134735155/7032209.pdfIn PDF document text
    • https://cdn.sqhk.co/tedefoso/8idI3v8/jonenesavavuborulinefadaw.pdfIn PDF document text
    • https://cdn.sqhk.co/jidulopavoji/ih1m3gj/lifestyles_of_the_rich_and_famous_instrumental.pdfIn PDF document text
    • https://pumagawiluzade.weebly.com/uploads/1/3/4/6/134697536/4903631.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460058/normal_600db8e4afcc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527237/normal_5fd1353dc96d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449618/normal_603f8f435bd3f.pdfIn PDF document text
    • https://xuxurebero.weebly.com/uploads/1/3/4/6/134673100/maxulanaje.pdfIn PDF document text
    • https://cdn.sqhk.co/tajaketo/hH3SkYM/dental_assistant_hygienist_air_force.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471484/normal_5fd128929d2ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384150/normal_5fd18f1350807.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408713/normal_5fe27fdc0d02d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476577/normal_5fcdfdad5f701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416128/normal_5fe9014495642.pdfIn PDF document text
    • https://malinozibide.weebly.com/uploads/1/3/4/3/134380659/magubejaw.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_72724f8c2a5540a6bd63b0ee62dde99f.pdf?index=trueIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_dac76321da7e49449c67ffbba2f68efd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc761d9f-699c-40bb-b191-ac149cf83b75/40289540809.pdfIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_23cd99c758004013bde09b78be306ade.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/135dc437-a458-4f31-83e9-7ab2ec269362/sony_trinitron_tv_price.pdfIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_c0d63778ce1e4822bd34b79831799a27.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac1c9a8e-d2e6-4c78-8573-46c7bee6d600/xipevedikufumomuso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5738ae8a-a4af-477c-b65f-1d98d41ffabb/tipo_de_investigacion_aplicada_segun_autores.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/707502e0-ed3d-4f8c-9b31-cd69159f8c00/fintie_bluetooth_keyboard_passcode.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001b649.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1B649 21976 bytes
SHA-256: 6855eab18e81fce575353d4d922a4fc5997d67489264d9b8cf0b2c0091922717
font_00_sfnt_off00016208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16208 5040 bytes
SHA-256: 005200f252c3a870c89957d1628f7ea5c4d52785ed8e995f1fae24eff321c755
font_01_sfnt_off0001732a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1732A 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off00017e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E8D 9984 bytes
SHA-256: 05eb67ca63b6b01dfd4945230ffe62cc3470af981918193354746e0fc5e48b87
font_03_sfnt_off0001a0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0F5 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6

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