Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c263fc3d2c48e37…

MALICIOUS

PDF

44.0 KB Created: 2020-11-07 01:50:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 98a512dbd4eb3a1dd45911b1badf9464 SHA-1: 3b27378601c1138cb628d81116c0e166204c38d0 SHA-256: 8c263fc3d2c48e37e47f9b3ec81265e8946d14494eb651a8b079afe525a2e3d1
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many pointing to disposable hosting services, suggesting a link farm or phishing attempt. The ML classifier strongly indicated maliciousness, and one URL, 'https://traffset.ru/aws?keyword=cyberpunk+2020+humanity', appears to be a malicious redirector. No scripts were extracted, limiting the analysis of specific execution behaviors.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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/aws?keyword=cyberpunk+2020+humanity PDF link annotation
    • https://derigibi.weebly.com/uploads/1/3/4/4/134447264/1809312.pdfIn PDF document text
    • https://novedoxax.weebly.com/uploads/1/3/4/5/134512377/fagepodogagupin-jexatupozekos-wolojune.pdfIn PDF document text
    • https://voxapinave.weebly.com/uploads/1/3/2/7/132740917/zazokafi_tinanug_zuwuxurulow.pdfIn PDF document text
    • https://lemefinafotujux.weebly.com/uploads/1/3/4/6/134606632/xoziv-gefunureveles-mekidilego-doroki.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/1198201.pdfIn PDF document text
    • https://vugilove.weebly.com/uploads/1/3/4/2/134234765/sajulux.pdfIn PDF document text
    • https://zafitageleg.weebly.com/uploads/1/3/4/4/134489703/nipudozazuno.pdfIn PDF document text
    • https://bomikuwutivibi.weebly.com/uploads/1/3/4/5/134598741/386486.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/076af90d-3e56-4ef0-add5-4c95cac3061c/97544470637.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/32490815481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a687d606-17fb-4615-bffd-024d21bff1a1/tds_water_tester_ppm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f334359-5228-486e-8175-3f70aa77d20b/calendario_2015_y_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/joint_venture_accounting_notes.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_off00006df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF4 5332 bytes
SHA-256: 07a99f967f8c9ed09e6f0f19443f4939c7117461f4d2379eb2f9179e087d80a0
font_01_sfnt_off00007fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FEE 10492 bytes
SHA-256: 79d66bad54cf838a50e83cebffe0535521edf9b7b1101d37e7731d9175533f2c

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