Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ead28c00d8fddf…

MALICIOUS

PDF

79.3 KB Created: 2021-02-28 23:51:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1e8d9159c2607651dfedaf767ea2cdec SHA-1: 9c394ccefab9632bb8fcedc789137b7553ff1729 SHA-256: d9ead28c00d8fddfa4ffdb3e19047a329e2e460b6686cda342cda85073500df8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://bologen.ru/123?utm_term=how+to+reset+rheem+electric+water+heater PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378606/normal_602c3a80acb08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377102/normal_6011045a7e520.pdfIn PDF document text
    • https://nukoxola.weebly.com/uploads/1/3/1/3/131380146/rinimosuwomefanimobo.pdfIn PDF document text
    • https://danodukuwen.weebly.com/uploads/1/3/1/6/131637043/c89eb6b.pdfIn PDF document text
    • http://tufofol.medianewsonline.com/el_nombre_del_viento_3_fecha.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488572/normal_603c0e9f55f69.pdfIn PDF document text
    • https://cdn.sqhk.co/xafigozenusu/icPijgj/mindshift_a_ricoh_company.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/rituals_of_memory.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381321/normal_60112877901c4.pdfIn PDF document text
    • https://gobodukigibab.weebly.com/uploads/1/3/1/8/131856162/mesufofodukeruvavade.pdfIn PDF document text
    • http://jawixogu.mygamesonline.org/soxurajiluve.pdfIn PDF document text
    • http://xojuxegalixiluj.66ghz.com/58255770745.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xiwozoget.atwebpages.com/how_to_analyze_an_advertisement.pdfIn PDF document text
    • http://vobujubiga.epizy.com/super_patch_sims_3_64_bit_and_metal.pdfIn PDF document text
    • http://bopisumeku.atwebpages.com/jezurimarurokazumubitaf.pdfIn PDF document text
    • http://gadoxijumulop.epizy.com/bethlehem_nh_police_report.pdfIn PDF document text
    • http://robowogutalopet.epizy.com/actualiser_les_formules_excel_vba.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_off0000f883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF883 5092 bytes
SHA-256: af1c5ae03ca82cfce43e3d4179bb221101ca7087f4136d1b7f57f5fb0d1305df
font_01_sfnt_off000109b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B5 11764 bytes
SHA-256: 50f2c50bdd4128a1dc76f1b5ac51780170924431230197667ce8f6e7d6927a51

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