Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6956d2b4b3ba5d…

MALICIOUS

PDF

71.2 KB Created: 2021-03-25 12:33:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5925c33d573410a12668c9b1c3daa1d4 SHA-1: db726f5445e2a9cd49d1825e0f1f5cfc7f85c8eb SHA-256: 1f6956d2b4b3ba5df7067f33e9ae91ba6da7afee56d7bfce1ac34fd094229df6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common tactic for SEO spam or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/123?utm_term=assessment+and+evaluation+of+learning+book+pdf
    • https://cdn.sqhk.co/matijamaj/jbmyNul/15332290765.pdf
    • https://cdn.sqhk.co/jewimebobi/cji6ODA/air_jordan_1_union_real_vs_fake.pdf
    • https://cdn.sqhk.co/lipisowonili/g7IdwwU/xumematetidixuramasez.pdf
    • https://cdn-cms.f-static.net/uploads/4459029/normal_60241d2f933f2.pdf
    • https://cdn.sqhk.co/lizuloka/bzAHK13/17361646890.pdf
    • https://cdn-cms.f-static.net/uploads/4368468/normal_605bed3170e46.pdf
    • http://mosomupusafebin.medianewsonline.com/57232859387.pdf
    • http://ponaxamewimenul.sportsontheweb.net/acres_of_diamonds_speech.pdf
    • http://pixunune.sportsontheweb.net/rasigogitejibipewikujox.pdf
    • http://pawezujexas.mywebcommunity.org/microsoft_onenote_manual.pdf
    • https://punelita.weebly.com/uploads/1/3/4/6/134679726/lenuna-zapesexugev-vefamiwuruloteb-dokowobem.pdf
    • http://retoxen.mypressonline.com/joint_venture_agreement_philippines.pdf
    • https://cdn-cms.f-static.net/uploads/4501656/normal_6058417b655f4.pdf
    • https://cdn.sqhk.co/xejudawadoni/ihEjihh/lebara_mobile_deals_uk.pdf
    • https://xorimaki.weebly.com/uploads/1/3/0/7/130739578/6761596.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_23ebcb4fea2640379d08d9af02761ac6.pdf?index=true
    • http://zubeleboju.epizy.com/infinite_jest_reader_s_guide.pdf
    • http://zugukasamudin.epizy.com/fazabasanub.pdf
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_fed48f152a6b4e4d84ce72d460f4a7c8.pdf?index=true
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_0e4ca9c1010347ff87640b02ceec4d4f.pdf?index=true
    • http://kapodos.rf.gd/kokakugoku.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_off0000dae0.bin
32b11c0b6a33b56416dcb12f7da339289a1a685e2a6cfed80dd117eec0b9ae7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE0 5616 bytes
font_01_sfnt_off0000ede8.bin
18bcadb535236543e86348fc8073c75fc2aa71021032f6c1b36b85b17b723f48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 9740 bytes

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