Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c5b9a76920e1ad1…

MALICIOUS

PDF

78.3 KB Created: 2021-02-22 02:29:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 57cd0591da77c3f5d8d9b74b8a770c4e SHA-1: 6282fb171c833625c772dfff2106e395ae28af88 SHA-256: 1c5b9a76920e1ad15e86866ba257e801fa113cb045f576f69c346c7620dfb764
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 embedded URLs, many pointing to disposable hosting or link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to 'The Lorax' book, a common tactic for phishing or malware delivery.

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://seumenha.ru/strik?utm_term=short+summary+of+the+lorax+book PDF link annotation
    • https://bilewobadazape.weebly.com/uploads/1/3/2/6/132695578/9065949.pdfIn PDF document text
    • https://cdn.sqhk.co/tezasevimab/gf63wha/pelinoliraxed.pdfIn PDF document text
    • http://rankingcoach-seo.com/37889772082tf5v1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449769/normal_5fd1c8a800d0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495551/normal_5fcc6454f0385.pdfIn PDF document text
    • https://zosujugopaw.weebly.com/uploads/1/3/4/5/134509911/7321454.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369179/normal_5ff885862602d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454995/normal_601c9cec78e0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413370/normal_5fea3bffe16d5.pdfIn PDF document text
    • https://sekatuxu.weebly.com/uploads/1/3/4/8/134894727/4703923.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/palikuvexake/agenda_2020_excel.pdfIn PDF document text
    • http://sibubixusa.epizy.com/linen_sheets_washing_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/cf_lumen_pro_3._70_apk.pdfIn PDF document text
    • http://taxisariwoboduz.epizy.com/96532198952.pdfIn PDF document text
    • http://safatezep.epizy.com/labivuzuziruzemevubufep.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/aged_care_guide_vacancies.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_off0000f605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF605 5484 bytes
SHA-256: 849e2633cdad9f97c748e7fed5b738a47c6ee44de379711abf676e0f0bcc6b87
font_01_sfnt_off0001088a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088A 10368 bytes
SHA-256: c55aa72f82a0a0ab6d45ab0f7ee91d297f6f6f9e62c4f7c700d758e874b7fbae

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