Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa10348af2beb134…

MALICIOUS

PDF

62.1 KB Created: 2021-02-18 14:47:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4c222d5670ff71c93046ab2070a01389 SHA-1: 4910386c66fc3bcd8e071a4a90d826e53166cd7a SHA-256: aa10348af2beb134523f451ba54e02a0298436ea769262d1a297be13004f5cfc
186 Risk Score

Malware Insights

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

This PDF file is classified as malicious by ML models and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful websites. The document body, though truncated, contains a lure related to watching a movie online, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/wb?keyword=watch%20salem PDF link annotation
    • http://sewonmedix.ru/cricket_game_information_in_marathimmu05.pdfIn PDF document text
    • https://cdn.sqhk.co/zojudaje/Aehgu4d/nugofopi.pdfIn PDF document text
    • https://cdn.sqhk.co/lupokuna/geji1HB/arrow_going_up_emoji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401973/normal_5feeeececba8b.pdfIn PDF document text
    • https://masudokunu.weebly.com/uploads/1/3/4/7/134731157/dapiruvomuvov.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/ixgfnhg/87963877031.pdfIn PDF document text
    • https://cdn.sqhk.co/govamopega/c3gjzvM/lexobijivo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373502/normal_5fdd8ec14f3d1.pdfIn PDF document text
    • https://voxudipuxun.weebly.com/uploads/1/3/5/3/135319737/1051104.pdfIn PDF document text
    • https://povemiloten.weebly.com/uploads/1/3/4/6/134608376/muboxebib_bujezotetewaze.pdfIn PDF document text
    • https://kokilanoru.weebly.com/uploads/1/3/4/0/134012510/9856284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417422/normal_60163da5f14f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493891/normal_602cb0a26fb6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409257/normal_5fe0110fce8ef.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/xamibebulosaxug/acute_bronchiolitis_symptoms_merck_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/basexawopolofafomijatu.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/75420682706.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/physics_dictionary_app.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F0 5704 bytes
SHA-256: 64165f62ae3a4ca5b9760998e562e9e8bab37a97956d2d17257a9412187c38e5
font_01_sfnt_off0000cb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB49 9316 bytes
SHA-256: 47a2a34ccf1a28ee69901c83c84d5f52c21c2dad37cf77bf3d85944fe958912b

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