Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d81a96fc608ac8a…

MALICIOUS

PDF

70.8 KB Created: 2021-02-20 08:27:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7116a368159736966d86ad31fc31503d SHA-1: 662f6357370b0cd41b0deac676700178f38b5398 SHA-256: 4d81a96fc608ac8a59f43dbc5608c01876671b3dc4ea1d93ecd6ecf745f0d3e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, flagged as a 'PDF_SEO_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The primary attack pattern involves redirecting users to external URLs, potentially for credential harvesting or further malware delivery.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/123?utm_term=how+to+setup+dd+wrt+repeater PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489251/normal_5ff9c583af838.pdfIn PDF document text
    • https://resivoviwogo.weebly.com/uploads/1/3/3/9/133987135/ruxod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413111/normal_5fe38ce2e9a99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449968/normal_5fc728d07ad14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421767/normal_6006bfb60e954.pdfIn PDF document text
    • https://jewelilug.weebly.com/uploads/1/3/4/3/134331877/2638863.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/tamobalasu/right_heart_failure_guideline.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/netlink_nbn_trust_annual_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/28862576595.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/pathway_fistula_perianal.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/lokugafijenuxusifibaluk.pdfIn PDF document text
    • http://wanabovemuzume.rf.gd/28362607428.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/wufobunazovudogusizejaxes.pdfIn PDF document text
    • http://bobupugarini.epizy.com/myriad_pro_boldit_font_free.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_off0000d851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 4976 bytes
SHA-256: 5dd27495420a2c1689fbe65b2d832a3ed2d3dd4dbdc44d6e52b1bf610084b91b
font_01_sfnt_off0000e954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 11648 bytes
SHA-256: 09ea61c40656528a967b8f4a82cefbae0e91bd47ea87ad9db99419c0684c7f2f

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