Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f46e3bc62944b2…

MALICIOUS

PDF

85.4 KB Created: 2021-02-16 07:50:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ee828ca7411daa15b37211c0abd2443e SHA-1: 28d093ffe7909cd4d07a42b2c2e2cdec7b55a2c2 SHA-256: e3f46e3bc62944b2fb7b94bbbd09c7213637b93f2d15ec7a5676c52a34b27217
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious document designed to redirect users to potentially harmful content.

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://bologen.ru/wb?keyword=highest%20paying%20information%20technology%20jobs%20in%20south%20africa PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490001/normal_6020cfa80c767.pdfIn PDF document text
    • http://vnds-v.website/advanced_strength_training_program8bl3q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456685/normal_601bf9ea88343.pdfIn PDF document text
    • http://blockhcain.host/96083565070campj.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/tibunanogowulefijimupabaxzmaao.pdfIn PDF document text
    • http://spindlndou.space/bodyguard_movie_mp4_apkjg85j.pdfIn PDF document text
    • https://dusomekekonipa.weebly.com/uploads/1/3/4/5/134580960/1964ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490371/normal_600936ba09a08.pdfIn PDF document text
    • http://myyshooop224.site/22402239526ctxx0.pdfIn PDF document text
    • http://probnik1313.tech/48388555084gx82f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480753/normal_60168c3d1c035.pdfIn PDF document text
    • http://cg-designer.xyz/wawuxilogugiwilemonkujs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403539/normal_5ffb92f1867e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494451/normal_5fdc1eae33949.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://redepulevinevux.epizy.com/sheetrock_garage_code.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001010a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010A 5592 bytes
SHA-256: b199cd3c7a55653f03a35460a1d2189aaea06903641000a91888cacd94bb899d
font_01_sfnt_off000113ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EF 11172 bytes
SHA-256: d66309c6081cc9eeaeada57140821da5f0c535e96c932d9043ac41b72122d744
font_02_sfnt_off000139d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D5 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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