Malicious PDF — malware analysis report

Static analysis result for SHA-256 9819430ec54a2bae…

MALICIOUS

PDF

71.8 KB Created: 2021-02-23 05:41:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c402fbda3459e67daff0765dacba11b8 SHA-1: f1a3b9c38a55f0a8bcf0d00bee14eaabc68779f7 SHA-256: 9819430ec54a2baee9c575009fdf2ccf2f1c53fb2a29b507f4c28bb31c918a8e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the PDF as malicious, with a high ML score. The embedded links likely serve as a distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wb?keyword=mary%20poppins%20quotes%20imdb PDF link annotation
    • http://ashotik.space/d_day_in_hd_history_channelmtz76.pdfIn PDF document text
    • https://bejasesazopo.weebly.com/uploads/1/3/4/5/134512805/5379304.pdfIn PDF document text
    • https://sugopubix.weebly.com/uploads/1/3/1/6/131637077/nixekibatev.pdfIn PDF document text
    • http://zemegazi.22web.org/xajivex.pdfIn PDF document text
    • http://mpvideo.org/coconut_cures_bruce_fifes77zm.pdfIn PDF document text
    • https://cdn.sqhk.co/lutaxudepoje/Kggjcib/new_invaders_definition.pdfIn PDF document text
    • https://bisuxijux.weebly.com/uploads/1/3/5/3/135323954/a1d64f6b2e1feb6.pdfIn PDF document text
    • http://nukicew.xyz/how_to_access_wsj_without_subscriptionho7cy.pdfIn PDF document text
    • https://fumitosebajogo.weebly.com/uploads/1/3/0/7/130740118/bb0f25fea74.pdfIn PDF document text
    • https://dekitinuro.weebly.com/uploads/1/3/4/8/134871397/fobixefojuna-tuwigi-mufok-fogotilawibaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/fajigolixoban.pdfIn PDF document text
    • http://votoromuw.epizy.com/borderlands_2_game_guide.pdfIn PDF document text
    • http://sadisuden.epizy.com/digirofarokawu.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/helix_waltz_guide_characters.pdfIn PDF document text
    • http://womunek.rf.gd/kezozejufibesudewip.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_off0000ddc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC5 5444 bytes
SHA-256: a2236633cb6a910a6ce03cac6af19bb479133159baa6f6fb696b59aba3f2db3a
font_01_sfnt_off0000f03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 10124 bytes
SHA-256: 3694865edef67706e3a66aaf25e03e85f51bff3a89e294c1b7793ff2fc7faaa5

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