Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0be6504b5c80ac…

MALICIOUS

PDF

68.8 KB Created: 2021-02-07 08:31:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e8c355d0604afe50d1406a111d7e17a6 SHA-1: a6a9443c77c867809f0148164bb8a16adc444096 SHA-256: 4d0be6504b5c80ac410ae28e8082a922c9a6b8fb43009606b080b0b75fa818ff
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. The document body, though heavily obfuscated, contains keywords like 'accident reports' which could be used as a lure.

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=accident+reports+middletown+ohio PDF link annotation
    • https://xadutodibuj.weebly.com/uploads/1/3/1/1/131164520/tubalatemawek-zutodo.pdfIn PDF document text
    • http://starconflict-game.ru/240119174542awmc.pdfIn PDF document text
    • http://koreanluxe.com/9299995762208vz.pdfIn PDF document text
    • http://tronreserve.online/kosapenafawapmt0xg.pdfIn PDF document text
    • http://boomua.site/wamezukutoz9f13v.pdfIn PDF document text
    • https://mugilofovoki.weebly.com/uploads/1/3/4/6/134616553/75b0412f.pdfIn PDF document text
    • http://bbflowers.net/alicia_keys_song_new_yorkc4koj.pdfIn PDF document text
    • http://youralteragoods.com/sequence_mitos_y_heroes_terminale2de6f.pdfIn PDF document text
    • https://cdn.sqhk.co/kowaziwaso/ejbMYji/7379560145.pdfIn PDF document text
    • https://wimukevefom.weebly.com/uploads/1/3/0/7/130739067/javiw-juluwexasezovi.pdfIn PDF document text
    • http://instapriz24.site/mitosis_worksheet_answers_biologyy2wkj.pdfIn PDF document text
    • https://cdn.sqhk.co/gufadiviw/yhhKdhf/gazuwazutijefubomotuda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475197/normal_5ffe4ae338cb6.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_off0000d34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34F 5184 bytes
SHA-256: bc22d4d9ea94b70926717b02c5ca0f3d95e90c9b05e8f5085d7e685feb430a7e
font_01_sfnt_off0000e4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D9 9800 bytes
SHA-256: 0927cd91b6d12e3ab639e1ae466e72ca4a51cf4117cf65dec3eeff8974aca8c6

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