Malicious PDF — malware analysis report

Static analysis result for SHA-256 4436116ac2c2dba1…

MALICIOUS

PDF

70.6 KB Created: 2021-03-12 21:10:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ceaf626ed91f266a0f66c787347e0743 SHA-1: f510d00950150e60faccc1fa3848cd1f5a3013b5 SHA-256: 4436116ac2c2dba15e6a8c2768814d94e544f23fd78410f503e74c9100c5ec3d
186 Risk Score

Malware Insights

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

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 0.9996

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://seumenha.ru/wix?keyword=sandwich+stem+academy+summer+reading PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4390324/normal_5fee0f5a4fed2.pdfIn PDF document text
    • https://piwebodowumogoj.weebly.com/uploads/1/3/4/8/134857209/wepexojoj-warafidaz-navabibujatop-legapemoseliji.pdfIn PDF document text
    • https://munijames.weebly.com/uploads/1/3/2/8/132814228/sununifefimol.pdfIn PDF document text
    • https://kinurilidere.weebly.com/uploads/1/3/1/3/131379896/5891323.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/bipuzusolu.pdfIn PDF document text
    • https://xadadoroz.weebly.com/uploads/1/3/6/0/136024884/rixewozus_zuleb.pdfIn PDF document text
    • https://marotebage.weebly.com/uploads/1/3/4/7/134712984/liweseziku.pdfIn PDF document text
    • http://xilagima.66ghz.com/nifuworoluxuxifaluwenoxuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447436/normal_6043f14e4d5b9.pdfIn PDF document text
    • https://bozobamawokoruv.weebly.com/uploads/1/3/4/3/134350924/jupab.pdfIn PDF document text
    • https://gawozigojuvapa.weebly.com/uploads/1/3/4/8/134896601/5738432.pdfIn PDF document text
    • https://lefiletigej.weebly.com/uploads/1/3/4/5/134597596/1931998.pdfIn PDF document text
    • https://viwezoluzuwa.weebly.com/uploads/1/3/4/4/134401695/7233261.pdfIn PDF document text
    • https://rilawexiretik.weebly.com/uploads/1/3/4/2/134267086/xumenemewipe-xidep-kazan-teberudi.pdfIn PDF document text
    • https://wodiwige.weebly.com/uploads/1/3/5/3/135317556/febubi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_082388ef3d7a48799467f240f9df8d02.pdf?index=trueIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_f274c4ece1f944f6a17b8cf4f34f2582.pdf?index=trueIn PDF document text
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_16eac7d0c1ba4c039d30ce99fa4adf60.pdf?index=trueIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_3ef3362da85f48029712baca8cea704e.pdf?index=trueIn PDF document text
    • http://nabasuxogakuwet.epizy.com/carbon_capture_technologies_report.pdfIn PDF document text
    • http://ditajizuru.rf.gd/20906241177.pdfIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_ea7e698d962448358afbf0842c6e7480.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_off0000d73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73E 5620 bytes
SHA-256: fed58d53914e64290f18940e93d8675047c76992fd76c716c3754dee28767129
font_01_sfnt_off0000ea4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4C 10024 bytes
SHA-256: 0ac651a7b367be16a6230607c82e0691b6892a0ca554192e02e70a3f14937b76