Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1bf1392e59995a…

MALICIOUS

PDF

78.4 KB Created: 2021-02-27 00:39:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3a55c3ba68c7655bd278471694ef6960 SHA-1: 5a1ac7ecaa6e08f662edc1a6c304f2dba2441ddf SHA-256: aa1bf1392e59995a41855b3e130574456c84599b2635206e50e147f03b6e00eb
186 Risk Score

Malware Insights

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

The PDF file contains a link farm designed to redirect users to various external PDF documents, masquerading as search results for a movie. This technique is often used to obscure the true malicious destination and distribute malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/wix?keyword=diary+ng+panget+full+movie+download PDF link annotation
    • https://furimubabo.weebly.com/uploads/1/3/1/8/131856330/2184389.pdfIn PDF document text
    • https://fafotarume.weebly.com/uploads/1/3/1/0/131069904/toridega.pdfIn PDF document text
    • https://zibefaxad.weebly.com/uploads/1/3/4/5/134594794/9301422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490722/normal_6034819de2524.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474170/normal_60216acbea5b8.pdfIn PDF document text
    • https://tunorikiwevog.weebly.com/uploads/1/3/4/0/134097136/3987463.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/36155072003.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/poulan_pro_445_pole_saw_parts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450424/normal_60320ebb3bf4d.pdfIn PDF document text
    • http://mujoxoluvisukid.getenjoyment.net/envision_math_workbook_grade_5_printable_pages.pdfIn PDF document text
    • https://kuxivudu.weebly.com/uploads/1/3/0/8/130813582/xalalew_nikuvepo_nojumejev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kotenu/candlelight_punjabi_song_djpunjab.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/kawokat.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/87297051200.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/4692403238.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/ephesians_6_armor_of_god_kjv.pdfIn PDF document text
    • http://jitawidavez.atwebpages.com/jizixezivatesitubuzuze.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000107e1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x107E1 19856 bytes
SHA-256: cdf54868dcaff74d1c5f36d2355545f3c05a786c1ff39254941e19749c670f4a
font_00_sfnt_off0000d322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD322 5436 bytes
SHA-256: 27439c2acb2b1dc6b1e0da9993f920b5991d4ac8f4bc0bb9da07cb16e4679ef3
font_01_sfnt_off0000e5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B5 9896 bytes
SHA-256: 15c33658f590786b63e6f13d08a2dcc8aa58bc7cf40f90b70e84117de7301fd5

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