Malicious PDF — malware analysis report

Static analysis result for SHA-256 988b031f472ac96b…

MALICIOUS

PDF

83.7 KB Created: 2021-03-18 09:01:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7fcedf2cc7a4f9f1482f259c47514bdd SHA-1: 8ee1b802a11a8b19689a7994d592be0e90b0df87 SHA-256: 988b031f472ac96ba91080d877fe52aa9cddce42ce3d6b177bb52be87383b675
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/aws?utm_term=how+fish+excrete+ammonia
    • https://fupopafesuz.weebly.com/uploads/1/3/4/4/134443157/relan_wesuvomagexoxu_biwugujekoxetix.pdf
    • https://static.s123-cdn-static.com/uploads/4366665/normal_5fcdbbed80f1a.pdf
    • https://static.s123-cdn-static.com/uploads/4407807/normal_5ff3a43dcfbce.pdf
    • https://baboxubawuxi.weebly.com/uploads/1/3/4/6/134666135/lotalakib-bufozi-xabatikevapar-ruxisukamepese.pdf
    • https://cdn-cms.f-static.net/uploads/4474752/normal_5fe9c4bb1c2cf.pdf
    • https://static.s123-cdn-static.com/uploads/4393925/normal_5ff7f8d24ff96.pdf
    • https://levavago.weebly.com/uploads/1/3/5/3/135343263/pexunajuza_zukitoguba_pozerovazitije_nufuvopiguv.pdf
    • https://cdn-cms.f-static.net/uploads/4444874/normal_602930bded75b.pdf
    • https://static.s123-cdn-static.com/uploads/4391024/normal_60028a8ddaf7a.pdf
    • https://cdn-cms.f-static.net/uploads/4365634/normal_6046b924c225d.pdf
    • https://static.s123-cdn-static.com/uploads/4384470/normal_5fcf666f202f9.pdf
    • https://cdn-cms.f-static.net/uploads/4459323/normal_602ec091bb6b4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/liwafo/xekotekera.pdf
    • https://s3.amazonaws.com/donarepemi/doctor_zhivago_libro_personajes.pdf
    • https://s3.amazonaws.com/jivala/send_anonymous_sms_app_android.pdf
    • https://s3.amazonaws.com/tezofuretejom/kolomadezoxolozukofara.pdf
    • https://s3.amazonaws.com/gozifep/35778784798.pdf
    • https://s3.amazonaws.com/nuselufuzo/saving_sourdi_character_analysis.pdf
    • https://s3.amazonaws.com/dosipive/zuvazavubuzituxumetin.pdf
    • https://s3.amazonaws.com/fobupojowojon/91208597024.pdf
    • https://s3.amazonaws.com/jotizifime/87300193080.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bb5.bin
3df33c8a045eb2a0140615afd606c74d4dfe9f2ad86908b2d6f1b68d58be91fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB5 5208 bytes
font_01_sfnt_off00011d5c.bin
fa39d3df33b2e0ccb2ca9e34ab73e25f5e3bbdad56b4ed5147081df188eb6377		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5C 10672 bytes

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