Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb82c08987410960…

MALICIOUS

PDF

79.1 KB Created: 2021-04-07 00:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99e2ea90ee23fb18a0ab257755cbb62c SHA-1: 690b8b678a4532bd385eec7244045b434728478c SHA-256: eb82c0898741096006731b64d686bd061d30bb6d600f0ea56b80c94ccdba65d8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized content, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious websites, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/award?keyword=6th+to+10th+class+maths+formulas+pdf+in+tamil
    • https://cdn.sqhk.co/sevijeruba/hfib6ge/88032095223.pdf
    • https://malekijewa.weebly.com/uploads/1/3/0/8/130813883/takinixovujusulipev.pdf
    • https://cdn.sqhk.co/koxuzofu/vtuigQg/personal_safety_intervention_order_definition.pdf
    • https://jadomuvifaxa.weebly.com/uploads/1/3/5/9/135960305/tilezexelatine.pdf
    • https://sokowerifali.weebly.com/uploads/1/3/6/0/136053586/a7e4d9af1974e.pdf
    • https://zugasunisozabij.weebly.com/uploads/1/3/4/7/134759734/8308318.pdf
    • https://cdn.sqhk.co/gogerazina/c5ibejI/flappy_bird_360_degree_camera.pdf
    • https://namosupegu.weebly.com/uploads/1/3/4/3/134313644/5956478.pdf
    • https://lorotemorotur.weebly.com/uploads/1/3/4/6/134649447/3294495.pdf
    • http://sokitejosororag.iblogger.org/61984645453.pdf
    • https://jolibudowuw.weebly.com/uploads/1/3/4/5/134596284/bd195.pdf
    • http://vesixadaw.22web.org/aristotelis_poetika.pdf
    • https://zuveravovizopow.weebly.com/uploads/1/3/0/9/130969477/wosozit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/b5af7617-00da-431d-a804-b9e5b614806f/what_are_the_different_types_of_appeals.pdf
    • http://lutewefopuv.rf.gd/sowutagovixi.pdf
    • http://legizoro.epizy.com/94329777439.pdf
    • http://sonisan.epizy.com/calmato_40_sport_manual.pdf
    • https://uploads.strikinglycdn.com/files/17b438e6-637a-4cac-98c4-ca1087318192/hp_officejet_6700_premium_printhead_error.pdf
    • https://s3.amazonaws.com/wukevirenesu/ark_survival_evolved_android_apk_file.pdf
    • https://s3.amazonaws.com/vavabi/47083262035.pdf
    • https://uploads.strikinglycdn.com/files/9c6e6448-6140-4abb-9dbc-1fcd04fb612a/walmart_black_friday_deals_ad_2020.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e60f.bin
f7aec124ba7e7e5b2fce5519859c9f33b3c2f0fc74cb31331a225dc807f0ffda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE60F 5412 bytes
font_01_sfnt_off0000f844.bin
db7b737cc2b0360122abdc05be944b9c97535ea5bd364989209f6e9000fad3cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF844 11812 bytes
font_02_sfnt_off000120a6.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120A6 4324 bytes

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