Malicious PDF — malware analysis report

Static analysis result for SHA-256 7abb15643199fa31…

MALICIOUS

PDF

67.8 KB Created: 2021-02-26 03:04:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d98c899a285f9f93625e9dd2bb5ea5ab SHA-1: f77c2ba9260e131d2325c123a3a428d6fa9abb1c SHA-256: 7abb15643199fa313f5816d5a94c38347ea28ae8175e5c01b4c8c353b3ca0b87
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating a deliberate attempt to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/aws?utm_term=how+to+replace+oven+door+glass+kenmore PDF link annotation
    • http://pimifawimonidij.mywebcommunity.org/user_stories_examples_with_acceptance_criteria.pdfIn PDF document text
    • http://alluniversity.fun/gumetivulafibodoll6.pdfIn PDF document text
    • http://wedavinonuvovu.22web.org/96108919743.pdfIn PDF document text
    • http://gilumesu.mypressonline.com/how_to_clean_bosch_ascenta_dishwasher.pdfIn PDF document text
    • http://my-credit.info/romabi9crr.pdfIn PDF document text
    • http://strahuemsya.info/wafaxadurixezayelw.pdfIn PDF document text
    • http://kixurox.getenjoyment.net/jbl_xtreme_2_speaker_review.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/xowogugubenoseta.pdfIn PDF document text
    • http://geekcods.com/deluca_family_game_guiderio15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383915/normal_5ff2263c29798.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494429/normal_5ffe919a0c7af.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/xafaxotaful/vupot.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/35900295263.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/immunoglobulin_function_table.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/amsterdam_airport_map.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_off0000cc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1F 5572 bytes
SHA-256: ff9a0490ec4702bfd39120ded5ae845f0698558098246cd35a742887a904cb23
font_01_sfnt_off0000df11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF11 10356 bytes
SHA-256: fe1459c1f9bc2bc311d97fb8938a8dda521ff2ddb9ce3f92e74960317fe021f0

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