Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e14781f9893cbd9…

MALICIOUS

PDF

76.1 KB Created: 2021-03-19 17:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e3a29a8a852efd3becf0e03c1024e519 SHA-1: 5608885e54699b6372c9b051ad2d9617be297a80 SHA-256: 3e14781f9893cbd9aa1dd3c58ff06875dc85ae7c7dd6945c8178dcae1b0c453e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9998

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
  • 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.
  • 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=should+i+learn+f2l+algorithms PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447888/normal_600bf7726aaa7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527164/normal_5fdbfbf284e24.pdfIn PDF document text
    • https://cdn.sqhk.co/tixuniwe/aSN6BAC/air_hockey_soccer_tournament_bracket.pdfIn PDF document text
    • http://bimelar.22web.org/installing_and_configuring_windows_10_exam_70-698.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426060/normal_60143ba5aa331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481173/normal_602cf255c4e0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466143/normal_603599f775eb7.pdfIn PDF document text
    • https://garepogive.weebly.com/uploads/1/3/4/8/134871831/63da4089.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375361/normal_5fc91b2adb765.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/hbgeibQ/huey_helicopter_scale_model.pdfIn PDF document text
    • https://wuriwodek.weebly.com/uploads/1/3/4/6/134688082/12b4eb.pdfIn PDF document text
    • https://cdn.sqhk.co/zamikukodef/jvekvBR/73207338890.pdfIn PDF document text
    • https://wajigigo.weebly.com/uploads/1/3/4/5/134588105/gatenuziporege.pdfIn PDF document text
    • https://xizodekez.weebly.com/uploads/1/3/4/7/134769153/5531609.pdfIn PDF document text
    • https://gajaxaja.weebly.com/uploads/1/3/2/7/132712369/sobab_puxapap_jabufitubipel.pdfIn PDF document text
    • https://cdn.sqhk.co/xidujefonari/fjcheii/frag_pro_shooter_hack_latest_version.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rukojipunuwupur.epizy.com/poverty_reduction_strategies_in_south_africa.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_off0000df11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF11 5436 bytes
SHA-256: 8bc5fbf7b99f8b7f227a8e0243d39dff68bfc9c0def1de08bbcaecadecb03e80
font_01_sfnt_off0000f158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF158 10580 bytes
SHA-256: 9a7aae3b31229a9078a5601c9533ceb33544147a8179896c7399daea220eadae
font_02_sfnt_off00011583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11583 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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