Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed8450490e29306…

MALICIOUS

PDF

102.8 KB Created: 2021-05-12 06:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a4a9de9571be716d77db1145fbd06ee SHA-1: 1f9b98275b9cab4c1877db5f92ebc8dda536ff01 SHA-256: fed8450490e29306021597f58903546a7b5468642ad2adf1a2a9e19ee7a3ad92
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier also indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a malicious redirection or content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://nipisod.ru/strik?utm_term=48+inch+john+deere+d140+drive+belt+diagram
    • https://cdn-cms.f-static.net/uploads/4446019/normal_6066a3323235b.pdf
    • https://tidukefawa.weebly.com/uploads/1/3/4/8/134851120/liworemirilojizako.pdf
    • https://gifaxopolipo.weebly.com/uploads/1/3/0/7/130739444/gizusexilaronav-kuzijifuveti-ravafebixoditof-jitupejipubole.pdf
    • https://nuvitofoje.weebly.com/uploads/1/3/4/6/134640236/lorajefufebul.pdf
    • https://cdn-cms.f-static.net/uploads/4389095/normal_603d7c7a2c7ea.pdf
    • https://jevixivuxed.weebly.com/uploads/1/3/4/6/134622771/63458.pdf
    • https://gebiworopefibo.weebly.com/uploads/1/3/4/5/134583098/83969b81aaaf976.pdf
    • https://cdn-cms.f-static.net/uploads/4450884/normal_5fd2dbfc04645.pdf
    • https://pegiromilu.weebly.com/uploads/1/3/4/6/134683304/rujovaxe.pdf
    • https://pinoxelu.weebly.com/uploads/1/3/4/1/134108818/9401453.pdf
    • https://bemisawu.weebly.com/uploads/1/3/4/7/134716701/rebojojonigi-dinaja.pdf
    • http://gimerixifaxet.iblogger.org/data_science_interview_questions_medium.pdf
    • https://nuduxojobiri.weebly.com/uploads/1/3/4/6/134629521/db7c98013b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://notizawudix.epizy.com/bawusaruvuxolaguv.pdf
    • http://pinepukaxibitut.epizy.com/adeptus_titanicus_rules.pdf
    • http://vekokegam.rf.gd/how_to_attract_a_cancer_man_and_keep_him.pdf
    • http://bugelinuxobeva.epizy.com/philips_respironics_bipap_avaps_manual.pdf
    • http://jidapemoti.epizy.com/zinimege.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014f1b.bin
2f7e2bbdd6152acfdcd8605bf353fd045bbe6c0f78b7a5da84049d0384209107		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F1B 5832 bytes
font_01_sfnt_off000162e6.bin
71f9f15513d1837281b8b29ab4819c7c001cdfa7f4ed70c1b4fe84489b6bf736		 pdf-font-stream PDF embedded font (sfnt) at offset 0x162E6 12964 bytes

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