Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5cabcb86dd5fcc…

MALICIOUS

PDF

90.8 KB Created: 2021-02-23 02:11:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 36a6b3baf377229981e3fbd2ada18fc6 SHA-1: 5ef2b7d12d3d3129819b7166b9717a183876df2f SHA-256: 3a5cabcb86dd5fcc39702439e9d3369a441c6acceba9aced947e30b6e3624db4
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm for SEO purposes. The ClamAV detection and ML classifier strongly indicate maliciousness. The primary URL, https://jacksth.ru/strik, suggests a potential phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious intent to redirect users to potentially harmful content.

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://jacksth.ru/strik?utm_term=partes+de+un+motor+el%25C3%25A9ctrico PDF link annotation
    • https://guxovixig.weebly.com/uploads/1/3/5/3/135317997/81f68f8fdb3.pdfIn PDF document text
    • http://timelessdecorum.com/merofisusotalibufa2a78z.pdfIn PDF document text
    • https://jotipipadazazo.weebly.com/uploads/1/3/4/3/134319758/ef168ce3.pdfIn PDF document text
    • http://eliyalte.com/rozereferuvakego9ng9u.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/xd8edji/alchemy_classic_hd.pdfIn PDF document text
    • https://judurufag.weebly.com/uploads/1/3/4/6/134688768/vifefudadu.pdfIn PDF document text
    • https://votivugaxowo.weebly.com/uploads/1/3/1/1/131163932/9577205.pdfIn PDF document text
    • https://cdn.sqhk.co/gojikanemiju/iibhcTN/anki_overdrive_fast_and_furious_ebay.pdfIn PDF document text
    • https://foravidamekog.weebly.com/uploads/1/3/2/3/132303307/06837ce36b678.pdfIn PDF document text
    • https://pazarufawituxib.weebly.com/uploads/1/3/4/0/134000032/dasaduluzape_jusumajexi_lufazedaber.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/laginekux/wegodutezifar.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/lotus_elise_buyers_guide_s2.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/trumpet_sheet_music_disney.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/how_to_plan_a_flower_garden_for_beginners.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_off0001167c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167C 5108 bytes
SHA-256: ac6e71f8540952105811e01e91044507abcf87fe0d9142c4af3b1fbe91317ee5
font_01_sfnt_off0001276b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276B 11980 bytes
SHA-256: 14b30da2d4b42c2fca400a22c029765e385112e0b163b45ea854334e0faf2292
font_02_sfnt_off00014e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E07 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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