Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71f35d2c3de907f…

MALICIOUS

PDF

90.6 KB Created: 2021-03-18 07:51:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 437372b4e2093289210e84bed12d366f SHA-1: 58dd2ad2531e9e55d0edc57715af5d175fb57b69 SHA-256: a71f35d2c3de907fc3f633c064f832b41249884c1cc212e1cb2c7a4e484cc48d
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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/award?keyword=warhammer+40k+8th+edition+codex+pdf+download PDF link annotation
    • https://terojejiw.weebly.com/uploads/1/3/5/3/135348369/jibogezubizupanoze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420905/normal_60314c6bab25f.pdfIn PDF document text
    • http://hookup157.fun/73704919121ibxy1.pdfIn PDF document text
    • https://wugupuvexiso.weebly.com/uploads/1/3/0/9/130969254/9383512.pdfIn PDF document text
    • http://pubguckazan.com/49339240729lloa5.pdfIn PDF document text
    • https://tejikapor.weebly.com/uploads/1/3/1/3/131382395/xojugirotima_gexofudobuzu_jorokusonevo.pdfIn PDF document text
    • http://siteznakomstv69.space/67235162726vhugg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426572/normal_601e6dbac04a6.pdfIn PDF document text
    • https://fabuxitewuf.weebly.com/uploads/1/3/4/3/134349615/sexifuna.pdfIn PDF document text
    • http://leqqurint.online/47285885915yrllv.pdfIn PDF document text
    • http://galoomer.online/rules_of_civility_amor_towles2ai8o.pdfIn PDF document text
    • http://1green.space/95528715669yldgs.pdfIn PDF document text
    • http://profaudit32.ru/pufakudutanokevb2wfr.pdfIn PDF document text
    • http://iminn.ru/vanekijasivphm1.pdfIn PDF document text
    • http://mklhhhh.space/pamilenawiog6op.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
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_882b9872467749939e6fb1736181ac2d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/banalor.pdfIn PDF document text
    • https://2e9d2e4a-15d5-4529-8b29-235aceea4e08.filesusr.com/ugd/cac96f_42075ffe88884154a5e074435042bcdf.pdf?index=trueIn PDF document text
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_6dc59be69f8044caab817f6fb45d50ca.pdf?index=trueIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_82c4edbe58614fd78e67c797e430ccb8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/gotranscript_test_answers_latest.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_off0001168c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168C 5664 bytes
SHA-256: 3d19a1af79be6d5306c857e3ab438a75282742a6b13b11a4d5411768f1f5d66e
font_01_sfnt_off000129c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C5 11520 bytes
SHA-256: 4e16a6c084f1f58ce81798fa550f05aaee6d4f317d91df6735e21501240233ec
font_02_sfnt_off00014f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F0A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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