Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0eef6e71fb88f3…

MALICIOUS

PDF

79.0 KB Created: 2021-03-16 10:21:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 07ce79fffcb4c1d88b12a528ce8f79fd SHA-1: 4879cc02b2cfd59bcc7a81d3cc517e0d8823f448 SHA-256: 1a0eef6e71fb88f3eb8a0ab798c8380037a24c0bfb8218972aacf219986f0a0c
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, many pointing to disposable domains, suggesting a link farm or SEO spamming operation. While no scripts were directly extracted, the presence of external URIs and the nature of the heuristics suggest the document is designed to lure users to potentially malicious content or exploit vulnerabilities.

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://botokaw.ru/award?keyword=allures+45.+9+pdf PDF link annotation
    • http://educationonline.website/229215878703csll.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383327/normal_60029b2dd2b1c.pdfIn PDF document text
    • http://pl50off.info/77512259826h3cez.pdfIn PDF document text
    • http://scandisvet.ru/iphone_5_se_launch_date5xd6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369302/normal_6017840c6705f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365601/normal_604e6d0b2a73f.pdfIn PDF document text
    • http://tryraisins.club/afro_asian_literature_download5gn2i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413227/normal_6021a9f1ce3dc.pdfIn PDF document text
    • http://counterman.ru/wapiregakalekx8e9j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495241/normal_6017336fc8055.pdfIn PDF document text
    • https://cdn.sqhk.co/safovokon/gcibjb4/82964655727.pdfIn PDF document text
    • https://cdn.sqhk.co/jidelugob/Rgejfjb/life_simulation_games_pc_free_no_download.pdfIn PDF document text
    • https://cdn.sqhk.co/matijamaj/gjdi2ie/enderman_epic_minecraft_wallpaper.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://45884d5c-3037-4093-99f9-9b9c28a1e9f0.filesusr.com/ugd/3721b1_6618a50737354ca58368a0e8158db777.pdf?index=trueIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_7b27253fd4ef4a7b84ba4ff5ffb15e5a.pdf?index=trueIn 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_off0000f4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 5216 bytes
SHA-256: a77d25a6c4433e2c4c36f12f448667d2f14b1bb06d8f9d66ffd441e847664667
font_01_sfnt_off0001067d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 11716 bytes
SHA-256: cffa085e4829cc435f28365629a75458ace4be52f9fc15192b5182a611d59e6f

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