Malicious PDF — malware analysis report

Static analysis result for SHA-256 96def664149c62c9…

MALICIOUS

PDF

73.9 KB Created: 2021-02-15 15:59:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7d7001a0dbac3526448cccfb19a55d93 SHA-1: 78e03a9096df7f585b09f3037ae305bb3ef7b6ab SHA-256: 96def664149c62c92b6c32f17509697b93e936ac96d6b853121c66ddd5e8f3c6
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagging it as a redirector link farm and a potential phishing trojan. The document contains a large number of embedded URLs, many of which point to potentially malicious or disposable hosting services, designed to redirect the user to further malicious content. The primary malicious URL identified is https://yafferge.ru/strik.

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://yafferge.ru/strik?utm_term=pretties+scott+westerfeld+movie In PDF document text
    • https://static.s123-cdn-static.com/uploads/4420764/normal_600179e815bcc.pdfIn PDF document text
    • http://vakakuwumegus.22web.org/48468113125.pdfIn PDF document text
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/vuturur.pdfIn PDF document text
    • https://tulalesin.weebly.com/uploads/1/3/4/8/134876190/46283eeb3442f4.pdfIn PDF document text
    • https://votarozoxanobo.weebly.com/uploads/1/3/4/3/134315144/rivemafis.pdfIn PDF document text
    • https://ludekomu.weebly.com/uploads/1/3/4/5/134505051/3bd5265c3bb14e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468820/normal_6006930985f85.pdfIn PDF document text
    • https://satefavazavapof.weebly.com/uploads/1/3/4/7/134718375/805bdf.pdfIn PDF document text
    • http://wapajojakazewi.iblogger.org/jawij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374968/normal_5ff15be37cee8.pdfIn PDF document text
    • https://miboxijudowisu.weebly.com/uploads/1/3/4/4/134491333/6763405.pdfIn PDF document text
    • https://telixezudaridif.weebly.com/uploads/1/3/0/7/130775339/gajilijafowegidekod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zelixedamaxux.rf.gd/average_speed_of_answer_def.pdfIn PDF document text
    • http://fegidil.rf.gd/gumatanafewiwud.pdfIn PDF document text
    • http://sevetise.rf.gd/fidogewuje.pdfIn PDF document text
    • http://bezalilanele.rf.gd/biogenetic_theory.pdfIn PDF document text
    • http://lesasesodimavun.epizy.com/improving_speaking_skills_in_english.pdfIn PDF document text
    • http://patesosiw.epizy.com/vevowipamawefasinej.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_off0000e494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE494 5108 bytes
SHA-256: 65b3f125f9537d13e8421ea99556cc4a6dbcd589fbaa17b45d263b32a212bd32
font_01_sfnt_off0000f5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F7 10752 bytes
SHA-256: 6c9b076eaa87692fde9cec4a139894adfe7f78f3af229ec9331da8a3560ab3ba

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