Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ee8a9c03214487e…

MALICIOUS

PDF

68.7 KB Created: 2021-02-23 08:57:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: a1f1c7166320da1da8c88b30bd60ab7d SHA-1: 9493b2743b7fec4891b3f5c5105254c6d4342ac0 SHA-256: 3ee8a9c03214487e71c08624d19e878c2597ef670fdb7208018e41efbd4958df
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting or potentially malicious domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains keywords related to software downloads, reinforcing the lure aspect. The presence of external URIs and the link farm heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

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 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://maypoin.ru/wix?keyword=microsoft+mathematics+add-in+for+word+365 PDF link annotation
    • https://gipimosikiji.weebly.com/uploads/1/3/5/9/135963651/9006f3fbfcc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379477/normal_601f94d2c9e59.pdfIn PDF document text
    • https://losuwasujiro.weebly.com/uploads/1/3/1/6/131637226/sizas.pdfIn PDF document text
    • https://funavekun.weebly.com/uploads/1/3/0/9/130969801/2736288.pdfIn PDF document text
    • http://runmasten.online/the_binding_of_isaac_afterbirth_unblockedccqgn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369307/normal_5fdfd6080c064.pdfIn PDF document text
    • http://ita-fitness.fun/bloons_td_6_mod_apk_xpbl2s1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499979/normal_5fd784cad98aa.pdfIn PDF document text
    • http://cardio-natural.info/los_5_lenguajes_del_amor_gary_chapman_gratisag6oj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482402/normal_5fee06b7ae609.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419430/normal_60139af205fc5.pdfIn PDF document text
    • http://tradebot.space/learn_networking_step_by_step_onlinek583o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528876/normal_5fe0a92b6b2cf.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/tajimipojimo/hypertension_management_nice_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/61077630309.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/sap_basis_administration_handbook.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/febasuro.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_off0000d004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD004 5800 bytes
SHA-256: bc0e32ff8035ae0cd7c4f23bce88d37519ab1b6b27387c814860941ed80b6a62
font_01_sfnt_off0000e3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B7 9840 bytes
SHA-256: 20b0c86dda2f751b46cbf3f1db6397bc3a8f0b2abd687d1ad94dd44430c02da9

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