Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a6a2a4e357790e…

MALICIOUS

PDF

70.4 KB Created: 2021-03-16 07:00:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c02baa770d96f43e3bd7ff99f8d81726 SHA-1: f1aac6c28cd13c0d3d1f21a0ee847be793d9a518 SHA-256: f1a6a2a4e357790e22479a279b76fd4798ac127167eee9aa2fd96e9871ebdf07
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a ML classifier and ClamAV, as malicious and likely phishing-related. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the 'link farm' heuristic indicate a strong intent to drive traffic to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=friedberg+linear+algebra+5th+edition PDF link annotation
    • http://zosazufinur.mygamesonline.org/38794403387.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/jegjhft/company_wide_strategic_planning_examples.pdfIn PDF document text
    • https://gifenatewa.weebly.com/uploads/1/3/4/4/134480542/6411440.pdfIn PDF document text
    • http://letnesil.xyz/icewind_dale_2_complete_modsxv80r.pdfIn PDF document text
    • http://qqkaxes.xyz/saddam_hussein_wiferusc9.pdfIn PDF document text
    • http://useraisins.pro/vuxujidubiximowezatefilob7xovc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380230/normal_5fdc3d125d8b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476285/normal_6048c43f5ddae.pdfIn PDF document text
    • http://pogadai.xyz/radizuxv7yv.pdfIn PDF document text
    • http://pepariravifaza.getenjoyment.net/club_car_carryall_1500_service_manual.pdfIn PDF document text
    • https://lodavoxi.weebly.com/uploads/1/3/4/5/134505118/4940165.pdfIn PDF document text
    • https://safodejinuvi.weebly.com/uploads/1/3/4/7/134753113/7453753f93c1.pdfIn PDF document text
    • https://cdn.sqhk.co/tasokuxu/c8pigi7/88385542259.pdfIn PDF document text
    • https://gamajebijapam.weebly.com/uploads/1/3/1/8/131856653/pebataxi.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/perawokuponoke.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/bac1d966-250b-46bd-b602-af757ba47647/xaneximoruledize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b974ffb-930b-4e77-8e72-a7bee0b8fac9/53704773837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7cf5bf3-c595-4eea-934b-efc457358502/zoselotojitim.pdfIn PDF document text
    • http://tulajadulixo.myartsonline.com/ariel_sylvia_plath_amazon.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_off0000d4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C1 5128 bytes
SHA-256: 895ebf06312b8cdcee9cc5f0f5fdcb33d2a38398b4d81716b48f938f9a543e5b
font_01_sfnt_off0000e630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE630 11180 bytes
SHA-256: 4bd120b60a589814ec8ee25dce2f3e2f2468f9efed2b83b528f3a2893e01f20a

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