Malicious PDF — malware analysis report

Static analysis result for SHA-256 be51198c166095ef…

MALICIOUS

PDF

68.8 KB Created: 2021-01-25 08:29:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 05a1c7954640d30014ddf61ed53a816f SHA-1: 38a403e9706418d6c5d20c13beb2b49d0e51a06d SHA-256: be51198c166095efc7d633f32b8170e6d32c1ac76891d4afba65eec59da86cdb
184 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to distribute malware or lead to phishing pages. The ML classifier also strongly indicated maliciousness.

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
  • 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://traffking.ru/123?utm_term=usc+spring+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426257/normal_5fd2630956f24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455881/normal_5ff106eca6aa2.pdfIn PDF document text
    • http://reactivascotia2020.com/49465393225i7ruw.pdfIn PDF document text
    • http://visiblawty.com/fojovujitowaxemt49.pdfIn PDF document text
    • http://fruittea.space/kiboxenf9i7i.pdfIn PDF document text
    • http://familyit.info/agregat_malarski_controlpro_250r_wagnerp1rm6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487208/normal_5fd2d3edb1bff.pdfIn PDF document text
    • https://bexopugizabon.weebly.com/uploads/1/3/4/0/134042324/solivabolo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406806/normal_6008225f9423c.pdfIn PDF document text
    • http://ueuniti.website/smash_bros_ultimate_tier_list_august_2020nule1.pdfIn PDF document text
    • http://foodguideblog.com/8804584830291caj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rowomasogig.epizy.com/mamevunusota.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_off0000cf32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF32 5124 bytes
SHA-256: d466bd7ed4555200e9e7cf08ecffd046fdf04dc42dfaa84025fbca3097307d66
font_01_sfnt_off0000e0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BC 11332 bytes
SHA-256: 1fe6c6e06b48b96ac42f105e0a5fec3dca7b098e755042b0f69f36c71d7bad0f

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