Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca91d76f7f4e1726…

MALICIOUS

PDF

66.4 KB Created: 2020-11-19 21:25:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 425ed1418a45c22fcae0e19d1c2fab8f SHA-1: d3341361c8efda8d79f9722bb7b883a83fcdbbbe SHA-256: ca91d76f7f4e17267ed4ff993b14446680dc9333db9deb5a95dc80a54938cd07
272 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a lure related to mortgage loan servicing and includes numerous links, many pointing to known malicious redirectors or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links suggest the document is designed to redirect users to malicious infrastructure, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=volunteer+mortgage+loan+servicing+404+james+robertson+pkwy In PDF document text
    • https://noxurujoba.weebly.com/uploads/1/3/4/3/134384046/270098444.pdfIn PDF document text
    • https://purusoze.weebly.com/uploads/1/3/4/4/134495244/c8521e.pdfIn PDF document text
    • https://mijelowiwiloz.weebly.com/uploads/1/3/1/1/131163856/xisabasijubefut-mitedun.pdfIn PDF document text
    • https://talapilodegopez.weebly.com/uploads/1/3/0/9/130969507/2612681.pdfIn PDF document text
    • https://xataramev.weebly.com/uploads/1/3/4/3/134320843/bedijenutowulixa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450038/normal_5fa50ecbe7d4a.pdfIn PDF document text
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/selawavup_tugot_nivolaporiwaxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414172/normal_5f9c88d2d203a.pdfIn PDF document text
    • https://susokeruno.weebly.com/uploads/1/3/4/6/134656617/talegofebuset.pdfIn PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/55331fb9a2e434f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379240/normal_5faaf5b9da8bc.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/592a1dd3-ff93-470a-9ba2-d71fd811a435/forojif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c26fe134-f292-4856-a57e-75982c4bcdeb/super_sonic_flash_games.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_off0000c21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21E 5984 bytes
SHA-256: 7350d3cd779ae433269f2cefa26ee3601f052ea169663443c493086a022bf4c8
font_01_sfnt_off0000d68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68A 11228 bytes
SHA-256: ceaf0deaab53790c17c110c185ef6b819e43b847ebdee06b0c98ed616e9137f5

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