Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a063a838270d655…

MALICIOUS

PDF

67.4 KB Created: 2021-01-24 11:39:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 396b3aaa71310cf0cf2b7f91675a1e00 SHA-1: f1ab8f825f5751118c0124b2715fa61de0409bca SHA-256: 8a063a838270d6555dad925ff326ebe869b9388cec524622fc67246c22e05e75
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The embedded URLs and the file's structure indicate it is part of a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=taclane+kg+175d+operator+manual In PDF document text
    • https://razivizufizide.weebly.com/uploads/1/3/4/5/134525322/3355651.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/demelofen.pdfIn PDF document text
    • https://xafusotegemuwif.weebly.com/uploads/1/3/5/3/135304795/gedusanalel_vuxozekaxe_sutakuwux.pdfIn PDF document text
    • https://xubetiduradana.weebly.com/uploads/1/3/0/7/130739761/1471704.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421466/normal_5ffa6ec8ac832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376372/normal_600b717cc25a7.pdfIn PDF document text
    • https://gaturipagi.weebly.com/uploads/1/3/0/7/130739573/guxut_gukutubaw_rusoli.pdfIn PDF document text
    • https://gorejirulikem.weebly.com/uploads/1/3/4/7/134738880/7cf7056f81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390074/normal_5fd5f07da5b52.pdfIn PDF document text
    • https://gawosiluzetur.weebly.com/uploads/1/3/4/6/134631715/vidov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zefifimagami.epizy.com/4328878396.pdfIn PDF document text
    • http://kizuwopo.epizy.com/wudirutakulikojisigufofo.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_off0000c6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DF 5484 bytes
SHA-256: 1da124f123f671c0a7e2291c66b2bda238988b893818931cc6e11742304a7ee7
font_01_sfnt_off0000d982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD982 11508 bytes
SHA-256: f08eb6cbfe5aa2b43a63533a84fa1a7d9938365922a356523562cf01c67f416c

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