Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbec3c64a0f4c1ae…

MALICIOUS

PDF

76.4 KB Created: 2021-03-12 12:21:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2f845af9f2cd33a2faa427bc89b07431 SHA-1: 7f62ffd19c85b42c80a975cbc02d1dd25c5732e3 SHA-256: cbec3c64a0f4c1ae276acbdc9310a34dbe91d549927bef6af7309c26befee3d6
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the heuristic firings point towards a phishing or malware distribution campaign.

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://lozipotod.ru/award?keyword=iosh+risk+assessment+example+pdf PDF link annotation
    • https://kakituku.weebly.com/uploads/1/3/4/5/134589995/refilemuwa-virawi-gifafolut-mefeni.pdfIn PDF document text
    • https://zasawebisev.weebly.com/uploads/1/3/4/8/134865024/6875773.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366980/normal_5ffbd3fcd05e1.pdfIn PDF document text
    • https://cdn.sqhk.co/ziloteduxemo/diftje0/bass_booster_for_pc_filehippo.pdfIn PDF document text
    • https://gefobivuvevu.weebly.com/uploads/1/3/1/3/131380717/1528371.pdfIn PDF document text
    • https://dowamodugepaxa.weebly.com/uploads/1/3/0/7/130739159/9b326dc7bd1b10.pdfIn PDF document text
    • https://nolujamikudaze.weebly.com/uploads/1/3/4/8/134868466/numezapifo-jivunupopen-datub-jifimenivopemig.pdfIn PDF document text
    • https://tupedofezelazib.weebly.com/uploads/1/3/4/3/134368784/fudeti-tizaxom-zuwawutobisorar-kotufesofo.pdfIn PDF document text
    • https://xunijududivajol.weebly.com/uploads/1/3/0/9/130969830/zesemexulofo_foxano.pdfIn PDF document text
    • https://rafutadavo.weebly.com/uploads/1/3/1/6/131637052/6a92879c73a319a.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/eAd0gct/tojibemimi.pdfIn PDF document text
    • https://dawijenumekoxel.weebly.com/uploads/1/3/6/0/136087820/7e42b79128ff92.pdfIn PDF document text
    • https://dufamapa.weebly.com/uploads/1/3/4/3/134399252/puvopuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373998/normal_5fdc18bad763d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391308/normal_6032b70736b28.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://jabodegodonirad.atwebpages.com/17739145775.pdfIn PDF document text
    • http://mugomodag.atwebpages.com/cassandra_database_architecture.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_off0000e105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE105 5136 bytes
SHA-256: be92368b0f21a08115b1950862f932348fe3ff7954b6dd0e806f56531c2e2608
font_01_sfnt_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 10792 bytes
SHA-256: c58b91a6070ef32b1709b2cd70eaaf4445dee38df4eaf1e3543e61c46774f1f3
font_02_sfnt_off000116a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A1 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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