Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f942c9e6bb6c7a…

MALICIOUS

PDF

64.6 KB Created: 2021-04-12 18:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a32c9bba81d5710638150c66371d2363 SHA-1: 78bf8b82d1ec46fbd52aec807a3458cdf84a62f8 SHA-256: 79f942c9e6bb6c7ab28439340131a1be0b3d27102f7e750a4b1b31e171a6d684
184 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links, with at least two pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, which can be abused to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/strik?utm_term=what+is+the+daily+quote In PDF document text
    • http://robot3.site/voziropatonopub9g9nz.pdfIn PDF document text
    • http://ipoteka.net/36220154608ebyim.pdfIn PDF document text
    • http://kvyovk.xyz/serevoriwudulazenizefu4gydq.pdfIn PDF document text
    • http://peludofnor.fun/18496339861b6kul.pdfIn PDF document text
    • http://yblda.fun/75546595235bdon9.pdfIn PDF document text
    • https://zuxevuzefadum.weebly.com/uploads/1/3/0/7/130775429/fbbc9fde17b87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369495/normal_6052c1fc3a787.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463286/normal_5fd91757e3d87.pdfIn PDF document text
    • https://lozugukavokukes.weebly.com/uploads/1/3/4/3/134357100/923656.pdfIn PDF document text
    • https://sanevofodi.weebly.com/uploads/1/3/0/9/130969150/rowelok_memovixaluwol_xexomot_navuv.pdfIn PDF document text
    • https://bidoruwo.weebly.com/uploads/1/3/4/6/134651737/7b9b2ecc8aa7ae.pdfIn PDF document text
    • http://idealica-columbia.site/solutions_manual_organic_chemistry_francis_carey1hw9h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414672/normal_5fe6d74b71514.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/606b074b-5556-43cd-b6c1-2b88b615e10f/susifanitiwizexeva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2003b389-2e1e-4fb4-87c9-ac15e2dd4d4e/80453940476.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be2fcdcb-a43f-4904-a75e-819eeed9385d/gevusitogagizijod.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_off0000c06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06F 5056 bytes
SHA-256: 968dffb1445fddeeae96c4be6f1fd37bd7804baa5f7be7f4eb6c4acdc8647c04
font_01_sfnt_off0000d1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B0 10088 bytes
SHA-256: 2b3b5b4b70fd02d560ce758de3ef6c5990b5464cbdca2bff0a68541994f144f0

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