Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddef56b0e0cecd18…

MALICIOUS

PDF

69.7 KB Created: 2021-05-11 12:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6126d298b88b3473f2c1aebe61134868 SHA-1: 50c4f0a440e2141b4572fa86f664a5cc45579109 SHA-256: ddef56b0e0cecd18f06f3cd207ec1fd1e352c15f3f858131d294274378b4d548
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://druttle.ru/strik?utm_term=400+day+clock+repair+guide+horolovar+download PDF link annotation
    • http://wadutijop.iblogger.org/vmware_certification_roadmap_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388427/normal_601659e61f3eb.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/herhijj/notes_app_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421767/normal_602edde5afa46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487200/normal_5fca03a416b46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528780/normal_5fff15ceaaaca.pdfIn PDF document text
    • https://cdn.sqhk.co/wafasojudo/vgfgjig/17614927034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467577/normal_6018d595050cf.pdfIn PDF document text
    • https://cdn.sqhk.co/zirigajer/5Kibggt/teleportation_circle_spell_5e.pdfIn PDF document text
    • https://cdn.sqhk.co/pebekaja/ZujhP10/xetipukizenisesasujaxilev.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/bZAX0gh/zeson.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tisigufaxiduvu.epizy.com/journey_to_the_end_of_the_night_free.pdfIn PDF document text
    • http://roboketisi.rf.gd/12194939675.pdfIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_ff1c023f91cb479c817ead384ea15885.pdf?index=trueIn PDF document text
    • http://mafakizukizunof.epizy.com/geometric_design_guide_for_canadian_roads_2017.pdfIn PDF document text
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_6c1cc7fcc997447195da3784a35ee1c7.pdf?index=trueIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_0a1159a3a1614450912f54d98fe670b4.pdf?index=trueIn PDF document text
    • http://vekawimiruv.rf.gd/76941620449.pdfIn PDF document text
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_fb2fa65fb83f4bd3b5822ac72b6b3aa7.pdf?index=trueIn 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_off0000d32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32C 5608 bytes
SHA-256: ea9f3b50e0cd30ed4fe20c5ee095e8d675e1bbec8c9acb9a4c0e6abc2b5cd3fb
font_01_sfnt_off0000e660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE660 9704 bytes
SHA-256: 53d93b389d6d250e68207a26362ff26c2aeaa976cac30707aadbe2a38f3e69dd

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