Malicious PDF — malware analysis report

Static analysis result for SHA-256 603c81241de9b8a8…

MALICIOUS

PDF

69.5 KB Created: 2020-12-24 18:43:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c2f6c10fae3b1ab733b7dc2a9fe4f3f1 SHA-1: 7eb4effc7084266d0906426b20f699f9e1ef8706 SHA-256: 603c81241de9b8a879b24e15b5c22f4cf68bb7af10af0ae86d7d6f185d11df43
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate this PDF is part of a link farm designed to distribute malicious content. While no scripts were extracted, the primary function appears to be redirecting users to potentially harmful sites, aligning with phishing or malware delivery tactics.

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
  • 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 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.
  • 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://gettraff.ru/strik?utm_term=world+war+1945+mod+apk+android+1 In PDF document text
    • https://wikefazopikevi.weebly.com/uploads/1/3/4/7/134715570/a6ef2.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxefoxo/g9hghaC/vavewajuguxerebuzama.pdfIn PDF document text
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/kuwut_xezabemokupiwon_gefepumababig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447916/normal_5fc3696df0257.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/6391395.pdfIn PDF document text
    • https://zonuloxovuge.weebly.com/uploads/1/3/4/4/134469127/7199517.pdfIn PDF document text
    • https://zigudufojivop.weebly.com/uploads/1/3/4/7/134718002/medub.pdfIn PDF document text
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/960b96b0e.pdfIn PDF document text
    • https://keduwiwisa.weebly.com/uploads/1/3/4/4/134486116/masazawesinox-zikugizof-valibegenijusa.pdfIn PDF document text
    • https://cdn.sqhk.co/supuzeren/YgZlgdR/fitbit_inspire_2_bands_leather.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496605/normal_5fb4db06144b4.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/afc221bc-c08a-4fea-8c21-2f1ef4c833f7/amistad_high_school_address.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a71acd53-ddde-4d41-8f83-e1f8350536b7/lebeka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f477c051-6128-4e81-9804-8be62cf8bd0d/the_purpose_driven_life_day_13.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62ec696d-03b9-4a1c-bdc2-066df180144e/58814952361.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_off0000d424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD424 5516 bytes
SHA-256: b1b517f64cc6919f88bd44cc9dd0ee575294950c5f2d767d74e1df00e569a3d7
font_01_sfnt_off0000e6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F3 9928 bytes
SHA-256: 66bad869a504cac530b3d96dfad7c9361fa878529a2370d81ae249a47c101141

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