Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa81dbf939209a3…

MALICIOUS

PDF

101.4 KB Created: 2021-04-01 17:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2a8e183d107dba63107b38cc56f7d26f SHA-1: 9d1ee1294312664ae2c8eb01b77ef8c15741f950 SHA-256: daa81dbf939209a3d3daae08d36251638be78b4fc8103ffd9fb285e6c6662bb5
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 0.9998

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://seumenha.ru/strik?utm_term=trainspotting+book+review PDF link annotation
    • http://noncomform.space/war_of_the_roses_york_family_treezgklj.pdfIn PDF document text
    • http://buybritishcat.com/facebook._com_api_androidng75y.pdfIn PDF document text
    • http://chategratis.online/photo_studio_artwork4uomq.pdfIn PDF document text
    • http://pubgucbayim.com/breaking_news_india_live_todayzf18o.pdfIn PDF document text
    • http://ttop-shop.com/disney_corporate_social_responsibility_report_2017am5my.pdfIn PDF document text
    • http://tpdreport.com/how_to_deal_with_conflict_in_a_multicultural_classroomot0om.pdfIn PDF document text
    • http://italonewsero.site/96466449973qtxhk.pdfIn PDF document text
    • http://rodina38.ru/gefavidipaxitefcodt5.pdfIn PDF document text
    • http://zootime.store/53845747599ltdsi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://42cc6f6d-9125-48bc-bce4-1bf15f49b1be.filesusr.com/ugd/7c30af_a32647c7156f48e69649118fe2235f68.pdf?index=trueIn PDF document text
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_4cbb7483c86546c496ce297e6a9fce41.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/geradi/85846070907.pdfIn PDF document text
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_ab7b90bcf4c346cfb508f4da63b6b4d3.pdf?index=trueIn PDF document text
    • https://def05634-b969-4265-beeb-1e7d695e9a44.filesusr.com/ugd/6865ce_469b5d66dabc466f8525607ab0c06c5e.pdf?index=trueIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_57de92b90cd84729875e7e300f2cd7d8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/a_n_frida_formal_dress.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/lubuveriperara.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/10834672611.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_off00014fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC0 5260 bytes
SHA-256: 32262fd48c79e0ec69984ab92cf03878ab12aedfbf6461fa9fba165994b8b345
font_01_sfnt_off000161c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161C7 11008 bytes
SHA-256: 6fe7259abece8e68b3167b34253c5286848cc8d546e7e2390e87d95319f8f5c7

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