Malicious PDF — malware analysis report

Static analysis result for SHA-256 98286ac67cd9c7f6…

MALICIOUS

PDF

76.6 KB Created: 2021-03-11 07:14:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 305c66c3a741bd569b157c4e006acea1 SHA-1: 203483dade5c264efa2fc4b52956ec93f5b872f9 SHA-256: 98286ac67cd9c7f696ea34718b5152da476526c9bb11e520cb1f31fa6a0d07ab
186 Risk Score

Malware Insights

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

The PDF contains a mass of external links, identified as a link farm designed to direct users to various websites. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=word+index+card+template+4x6 PDF link annotation
    • https://jumifusat.weebly.com/uploads/1/3/4/6/134629025/829109.pdfIn PDF document text
    • https://tejojixamabaje.weebly.com/uploads/1/3/2/7/132740549/7813480.pdfIn PDF document text
    • http://hopecommunitynaz.com/feed_mira_grant_charactersfrgv6.pdfIn PDF document text
    • https://bokirises.weebly.com/uploads/1/3/1/6/131607331/a10476d5dca802d.pdfIn PDF document text
    • http://madewithsunshine.com/kipesuk2g8ep.pdfIn PDF document text
    • http://clubstore.pro/920294149208cesv.pdfIn PDF document text
    • http://otomail.business/passport_form_downloadc4c5o.pdfIn PDF document text
    • http://uplrezina.site/most_popular_spanish_words_in_english_oxforde8s6n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476930/normal_5ffccc8a0f430.pdfIn PDF document text
    • http://bluhgang.best/base_one_how_marketo1up8.pdfIn PDF document text
    • https://vufujisuwe.weebly.com/uploads/1/3/1/4/131437295/munedimovesupeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497369/normal_601b34d8ed198.pdfIn PDF document text
    • https://ginadilu.weebly.com/uploads/1/3/4/7/134768391/tefogoboda.pdfIn PDF document text
    • http://tdsevsvet.ru/22365446907mzsen.pdfIn PDF document text
    • https://kegotewu.weebly.com/uploads/1/3/1/4/131437679/monojakakevukovob.pdfIn PDF document text
    • http://gratoraama.website/5421859230fdwls.pdfIn PDF document text
    • http://meetchambre.xyz/52778962063bjda4.pdfIn PDF document text
    • https://ruwefenoref.weebly.com/uploads/1/3/0/7/130739117/jarafapoxeluvad_vusujam_zezudixasoju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417315/normal_6023c8c72a292.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ed2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2D 5364 bytes
SHA-256: 0cd2e39bf339f9d182042ae72aac3d0ef5474289c73a0cf53d99cb41880cdead
font_01_sfnt_off0000ff6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6D 11136 bytes
SHA-256: 7b9f2086c42a5bd5b9a29930cb8898eed12171dacb31690cb2c177ac5346a0e5

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