Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50a279d5b7cfb3d…

MALICIOUS

PDF

68.5 KB Created: 2020-11-27 15:41:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 354b6356c31009935bdfbedffa211bf7 SHA-1: da52ea21a6f4db448319da4141b34a4dbfa9b708 SHA-256: b50a279d5b7cfb3d652c585d5cc6bf951c5e23ef96013d3581dfc712b69dadec
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDFs hosted on disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. ClamAV also detected this file as Pdf.Phishing.Trojan, and an ML classifier assigned a high probability of maliciousness. No scripts were extracted, but the structure suggests a malicious document intended to lure users to external sites.

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://traffine.ru/strik?utm_term=rocket+league+wallpaper+2560x1440 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_5fb7a488ddfa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_5fbcd57f00f77.pdfIn PDF document text
    • https://pepuzategazeg.weebly.com/uploads/1/3/1/4/131453576/9035824.pdfIn PDF document text
    • https://xukanodipu.weebly.com/uploads/1/3/4/8/134885825/xadenavok-pazevadowukemim-zisuzej-nusotalidog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_5fb4b56e3a82f.pdfIn PDF document text
    • https://sobegivi.weebly.com/uploads/1/3/4/3/134311910/5220080f917995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407729/normal_5f99b706d6b20.pdfIn PDF document text
    • https://lawijafixome.weebly.com/uploads/1/3/4/5/134588346/jumupes_rakenive_xakegaxonumir_putodudawubev.pdfIn PDF document text
    • https://xilamebi.weebly.com/uploads/1/3/4/5/134598653/9615365.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376606/normal_5f8a554902d7b.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/3fbc7711-9b7b-4011-a989-271cb025589a/xawewimikotebivuvuf.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/calistenia_iniciante.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1377921-2bde-4cc1-bd8c-61e5967091d3/walt_disney_world_logo_png.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_off0000c8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F0 5844 bytes
SHA-256: 020b68814666551cce8076889a93f976be8798641a334a6efc7285a745926189
font_01_sfnt_off0000dd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD12 12520 bytes
SHA-256: 312963353bc4823532cca04bd2c2e5606e3997ce058b2c8ea2332fda5b930757

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