Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c8a270f6e7fc7c…

MALICIOUS

PDF

72.6 KB Created: 2021-02-25 14:32:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 52e2a50eaac4e65f8931457a665e98b5 SHA-1: cf535cbc3f999bfb9d2169dfdf5fa6504749e475 SHA-256: 91c8a270f6e7fc7c3fa1df4668803cfd592ac140fc5b17dced155c3b3da7f781
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, with one prominent URL pointing to 'seumenha.ru', suggesting a redirection to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further supporting a malicious intent to distribute or phish. No scripts were extracted, but the overall structure and URL analysis strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/123?utm_term=knowledge+management+system+life+cycle+notes PDF link annotation
    • https://fakibugopozap.weebly.com/uploads/1/3/2/7/132712115/5fc00a6dd.pdfIn PDF document text
    • https://xoberaditide.weebly.com/uploads/1/3/4/6/134645794/fomisuwuxulosagufe.pdfIn PDF document text
    • http://autoupgrade.website/lirik_lagu_cant_stop_the_feeling_trollss3rsz.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/wewuwumorunezokuwedeporek0kgtg.pdfIn PDF document text
    • http://help-bluebadgecustomer.com/sharp_objects_shows_likezinjj.pdfIn PDF document text
    • http://vesibigezedenu.iblogger.org/jeriwigasuzuwedab.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/risalenefazozo/fepepuzi.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/how_to_rebuild_a_hypro_centrifugal_pump.pdfIn PDF document text
    • http://nokudumufax.rf.gd/jifib.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/18111867184.pdfIn PDF document text
    • http://rolozaj.epizy.com/woginifodevukufojolem.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_off0000e111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE111 5408 bytes
SHA-256: e52e1c7b661b3f727b43c1ac2f7640b72432ebad8543d576e6a2a621ad63d4cb
font_01_sfnt_off0000f38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 9920 bytes
SHA-256: 8bb2c6003162442f8620b6f709adb6736e7fa3aeee418fe77637222578ca0ab5

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