Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1f93a4b7a96386…

MALICIOUS

PDF

78.2 KB Created: 2021-02-14 06:30:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7f8362482f1abe17f0fcf590782a0910 SHA-1: 5bf6ee51f7036ec72ce8719bdd0f76293c42be6d SHA-256: 6d1f93a4b7a96386fcb5239e743e8828fe8d15670e657983dc586e18aa8e49f2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. These links point to various domains and PDF files, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute malware or lead users to phishing sites. The document body is heavily obfuscated and unreadable.

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://seumenha.ru/wix?keyword=town+hall+9+base+layout+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478408/normal_60215eafa851c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393018/normal_5fe48761e1085.pdfIn PDF document text
    • http://getliterate.online/38009787486l3ggt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422877/normal_6017036cde3e3.pdfIn PDF document text
    • https://buserakufazuwus.weebly.com/uploads/1/3/4/0/134097478/16a24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384655/normal_60279f3cabe2e.pdfIn PDF document text
    • http://uuuuull.space/world_junior_hockey_championship_2020ekxhf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496616/normal_5ff55680a2abf.pdfIn PDF document text
    • http://reawolt.online/58197417159yluty.pdfIn PDF document text
    • https://zokesafan.weebly.com/uploads/1/3/0/7/130775675/bodejege_pijatizosevubim_xiwokuvob_zejijukubif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414860/normal_60089b4d11dfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_600fdc67a6a37.pdfIn PDF document text
    • http://businesslinecenter.com/epub_to4r61t.pdfIn PDF document text
    • https://kuwujuzavasikit.weebly.com/uploads/1/3/5/9/135985591/gezitakare_pofetukiputeseb.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
    • https://s3.amazonaws.com/fodose/romipezozeketenikad.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/bangor_revision_guide_gcse_chemistry.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_off0000e883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 5224 bytes
SHA-256: 19b809fc534131b2da19cecda9f0c36fec7ed406e12f2200923b7b952cf4d351
font_01_sfnt_off0000fa5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5A 10320 bytes
SHA-256: fe6edc8aee82ae8b085b31b58f4c74f8ff096ed876f541f9daf8f4024a9e0c9b
font_02_sfnt_off00011d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D99 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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