Malicious PDF — malware analysis report

Static analysis result for SHA-256 30fc84dc5f5bbafc…

MALICIOUS

PDF

80.5 KB Created: 2021-02-28 13:26:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 657246dca4dfb2b609d79350912df582 SHA-1: ef3eb9e97a443e18c02e82a67ddf41889f7bffd7 SHA-256: 30fc84dc5f5bbafc394cee10b77e0ebfed7236a26f3d8124a15f9300ad71e203
156 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including ClamAV and an ML classifier, and contains a large number of external links, characteristic of a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest an attempt to redirect users to potentially malicious websites. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links point towards an initial access vector via spearphishing attachment, aiming to lead users to compromised or malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=weider+crossbow+advantage+parts PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368474/normal_60004531a7873.pdfIn PDF document text
    • https://cdn.sqhk.co/rubupidorinu/jdjgiiH/best_hotels_in_santorini_greece_with_private_pools.pdfIn PDF document text
    • https://jelugofinetala.weebly.com/uploads/1/3/5/3/135389066/3447203.pdfIn PDF document text
    • https://vuxulirupam.weebly.com/uploads/1/3/5/3/135346280/bc57230.pdfIn PDF document text
    • https://guxanavos.weebly.com/uploads/1/3/4/2/134235011/153bc3dde70b988.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452372/normal_5ffb1bff1188d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5fd9d86239dc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405930/normal_60297ed626af1.pdfIn PDF document text
    • https://gopogusefivow.weebly.com/uploads/1/3/1/4/131406686/soneribib.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/zemigiduwagafu/arm_cortex_r52_technical_reference_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/abaddon_dota_2_build_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/kenya_population_census_2009_full_report.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/44749122696.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/free_catering_contract_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/pepakisokorifiwu.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/answer_me_my_love_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/poetry_comprehension_worksheets_for_2nd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/lubem.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_off0000fe30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 5516 bytes
SHA-256: 1b420af79bef367ee3783714ef980a664afb3d78fdabd6057d005c60841c3a29
font_01_sfnt_off0001111c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111C 10560 bytes
SHA-256: 9c804a7db82a959246d753bacc6e729fd26ff46e065dc4e7d82028b81fdaf248

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