Malicious PDF — malware analysis report

Static analysis result for SHA-256 219e8bbd1ef885d1…

MALICIOUS

PDF

92.3 KB Created: 2021-01-02 12:32:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9617c1ab098fc43cd24a958823281093 SHA-1: 983c9f9858ba71a458e173cd17b516758f38da41 SHA-256: 219e8bbd1ef885d13f47f6b060ac0a4e4fe33a5dea60048a651a411db056f46e
246 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a seed-phrase/secret-recovery lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://traffset.ru/123?utm_term=android+generate+signed+apk+cannot+recover+key PDF link annotation
    • https://lokaxanexu.weebly.com/uploads/1/3/4/6/134638146/guwapixozojeneterapu.pdfIn PDF document text
    • https://vimedijo.weebly.com/uploads/1/3/1/6/131606629/fe83f1b2079e1.pdfIn PDF document text
    • https://zuduloto.weebly.com/uploads/1/3/4/6/134623707/ca43c3c659c.pdfIn PDF document text
    • https://nopubogap.weebly.com/uploads/1/3/4/6/134667077/1512648.pdfIn PDF document text
    • https://waniremupamed.weebly.com/uploads/1/3/1/4/131407535/tubaxajo.pdfIn PDF document text
    • https://wazexexa.weebly.com/uploads/1/3/5/3/135305699/ponobetiwuvawo.pdfIn PDF document text
    • https://junurewumopu.weebly.com/uploads/1/3/2/7/132740614/tagirasiniradifawoka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/47a09087-1afb-4ff5-8f8f-3ab363aba168/43973586721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/352d2383-7f92-4ca2-8260-6344b4eaa967/rabat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6293b281-c366-42c6-af92-74caa3d1a56c/60274799244.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebcd0370-13db-4a85-aa84-6417bbb9c78b/93036566747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f4a8355-7d5e-44f1-8d8f-622fc99b24c2/sample_recommendation_letter_for_employee.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_off00012814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12814 5424 bytes
SHA-256: 789dc1b538ff13244fadf78e8fce295d313f58b8c94a2637e902335f3347c9c5
font_01_sfnt_off00013aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA9 12056 bytes
SHA-256: f9b464040af844e182c82672fd9ca42195062a4f86c2fc75f676124713bc8792

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