Malicious PDF — malware analysis report

Static analysis result for SHA-256 de584a5421c4a05f…

MALICIOUS

PDF

97.3 KB Created: 2021-05-05 02:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2c084260e136ce131750fe0096ea5c77 SHA-1: 919c721771a41e213bf2abda89ae6356d6e32530 SHA-256: de584a5421c4a05f433117397fe79adeaa3d7661a749cc6e4ccd2e4a360dc33b
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic of encrypting payloads to bypass gateway scanning, implying this PDF is a dropper or part of a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://resalured.ru/strik?utm_term=how+to+make+gear+teeth+in+autodesk+inventor PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421200/normal_605db62fbd6f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477173/normal_5ff3394395d87.pdfIn PDF document text
    • http://afterdealer.pro/62338352724gx27n.pdfIn PDF document text
    • http://kabakotunaze.iblogger.org/tafovabodibejuda.pdfIn PDF document text
    • http://it50disconto.info/question_and_answers_definerzle1.pdfIn PDF document text
    • http://xazigewit.iblogger.org/gojebaremoronok.pdfIn PDF document text
    • http://nukadaz.iblogger.org/66717203468.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467003/normal_600e760ca6eb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471082/normal_6015015ba40dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486975/normal_5fdd95bd90d40.pdfIn PDF document text
    • http://aazzzry.space/disney_plus_login_issues_vpnnaqig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485443/normal_605692f493bf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450632/normal_602653d03b4dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452392/normal_5fd26f6ce74f8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gesinofafag.epizy.com/99339214970.pdfIn PDF document text
    • http://duxitupogewaxu.rf.gd/62638548260.pdfIn PDF document text
    • http://nelibusanexiput.epizy.com/dopiw.pdfIn PDF document text
    • http://fuliluxu.rf.gd/20693567.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA6 3080 bytes
SHA-256: 8574919c7c8a9f024103958ce015253c5a24b8e646cdb5f787658918713f2b2b
font_01_sfnt_off000139ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AE 5384 bytes
SHA-256: c62798674fe4da5b27277b3b5ffd0790e01c46086cef327770ebf358f2080d77
font_02_sfnt_off00014be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE5 13136 bytes
SHA-256: 933b4bf26d78d1a2bbc200c6a6f7a7bf4c52e125519c39190499d560384dfc8c

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