Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e5e8877625a24d…

MALICIOUS

PDF

73.1 KB Created: 2021-03-03 18:44:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5a5040aa8b6dbcdf71699dc04b9b8f13 SHA-1: 995ed19f7233773f97789bc57c81d6d115154684 SHA-256: a2e5e8877625a24d7921330bba116d6cc3443ac4fb659abca1add85814cd1cf0
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://vilenefex.ru/123?utm_term=motorola+xpr+6550+programming+cable PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407069/normal_5ff7b719b153f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470836/normal_602fda082fb91.pdfIn PDF document text
    • https://rojanebe.weebly.com/uploads/1/3/1/6/131637229/7e4a0dc151c.pdfIn PDF document text
    • http://wigigokewadusad.iblogger.org/66915411861.pdfIn PDF document text
    • https://zozetaxurumel.weebly.com/uploads/1/3/4/5/134590082/0701f632a59d.pdfIn PDF document text
    • https://xidumalebuwun.weebly.com/uploads/1/3/4/8/134894794/28087a779f6.pdfIn PDF document text
    • https://rijujofa.weebly.com/uploads/1/3/4/3/134323569/mekorosaxeniresezu.pdfIn PDF document text
    • https://muwujexowosis.weebly.com/uploads/1/3/1/4/131437891/punirosizateta-buzirepozoxigen-rapajepelamepek-vanexarozanajo.pdfIn PDF document text
    • http://wowunoli.22web.org/witevuvozojesif.pdfIn PDF document text
    • https://bozixezexa.weebly.com/uploads/1/3/4/8/134861503/letitawipa.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/gih3ifc/89331713469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465255/normal_5fe78b68bd96f.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/bPidida/jet_boat_racing_calendar_2020.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
    • https://s3.amazonaws.com/vixuwogetiv/66262496541.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/codecademy_python_functions_answers.pdfIn PDF document text
    • http://rinonefor.rf.gd/my_passport_ultra_1tb_manual.pdfIn PDF document text
    • http://nisogifamesada.epizy.com/lujiwosova.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/23990418226.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_off0000d32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32C 5496 bytes
SHA-256: b24941efb5db2c63e1d91d855c80918caa563227378844541c8c1519a0a36a7d
font_01_sfnt_off0000e5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C7 10336 bytes
SHA-256: 95bfc781f94ad8a2c7403b763f2335d7e974489134f25aa1fce201c57c37b0aa
font_02_sfnt_off0001093a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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