Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3fc504d118d0972…

MALICIOUS

PDF

75.2 KB Created: 2021-02-12 21:01:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2c773771de442b7aaf9cd4fd0ff12e83 SHA-1: 94819145708d32392e3f37e9295d548b95762bc1 SHA-256: a3fc504d118d09720c6789cae1612c053bd30d1de51a2c3a28eae0cafe3112f7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically as a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to host malicious content or phishing pages.

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://baarspo.ru/123?utm_term=h7+headlight+bulb+replacement PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475380/normal_5ff22a5fcbea0.pdfIn PDF document text
    • https://cdn.sqhk.co/lelabepena/hLPajjI/zara_black_friday_2019_hours.pdfIn PDF document text
    • https://meluwirukumipi.weebly.com/uploads/1/3/1/4/131483006/waxokaguditejiwemoxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378848/normal_5fdbc5361227e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479933/normal_600cc91ef054a.pdfIn PDF document text
    • https://guxojifupu.weebly.com/uploads/1/3/1/4/131438233/1af8e0.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzosexiwugu/TUcT655/79102621172.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382423/normal_5fdd7d140c681.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473938/normal_6012b2455b61a.pdfIn PDF document text
    • https://xonedapu.weebly.com/uploads/1/3/4/6/134654428/vetaruwuviwo.pdfIn PDF document text
    • https://cdn.sqhk.co/rogenujudita/tuhhjhE/zara_sale_2020_summer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405945/normal_5fefdcfb5e21d.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/sepovutapakogaf/jagizabuzuwuzaduv.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/mist_survival_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/beyblade_burst_evolution_tamil_episodes.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/xabafozanenozamikutezare.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/etoile_guide_michelin_alsace.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_off0000ea29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 5488 bytes
SHA-256: 0e81ae3aa00e894ec879c87d68855095df63f539ce61cba3e04607e089320449
font_01_sfnt_off0000fca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA9 10172 bytes
SHA-256: 7ec904bfa7bbfa47f21a5578e5c58f15fa29eaa18198db0e4fcdfe34456e4d9f

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