Malicious PDF — malware analysis report

Static analysis result for SHA-256 b940e9500a046392…

MALICIOUS

PDF

76.3 KB Created: 2021-04-06 23:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a611e801872e3f0de4c75a3476bfc6c5 SHA-1: 66554ac9024caa280e3cf309ff6622460555e326 SHA-256: b940e9500a0463927b285f34ddd05baadf862287fcfd6c4a3c9fe2360ac37f65
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as educational materials, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6484

Heuristics 4

  • 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
  • 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://pelibifir.ru/award?keyword=algebra+1+volume+2+teacher+s+edition+pdf
    • https://bopexetijajab.weebly.com/uploads/1/3/1/4/131411078/xutotoxi.pdf
    • http://static-start.top/central_nervous_system_brainf04n5.pdf
    • https://cdn.sqhk.co/javomekoru/czrjctH/mumiwiderexokerizuz.pdf
    • https://cdn-cms.f-static.net/uploads/4379987/normal_6047f700e1c40.pdf
    • https://cdn.sqhk.co/rogapakaler/hahb4je/friends_international_christian_university_merced_ca_95340.pdf
    • https://kajubogoxin.weebly.com/uploads/1/3/0/9/130969430/fofujipufuli.pdf
    • http://vsedlyatebya.xyz/89988043073d5nhg.pdf
    • https://cdn.sqhk.co/kiraxozi/7jefeia/power_pop_bubbles_apk_mod.pdf
    • https://cdn-cms.f-static.net/uploads/4376369/normal_5fdc5a33d0250.pdf
    • http://lnstagramverifiedbadge-media.com/physics_for_scientists_and_engineers_by_giancoli_4th_edsfu76.pdf
    • https://cdn.sqhk.co/nedabuke/vwo6igu/45137347596.pdf
    • https://cdn-cms.f-static.net/uploads/4410985/normal_603bf8872b187.pdf
    • https://cdn-cms.f-static.net/uploads/4482623/normal_6025dcc567cf4.pdf
    • https://cdn-cms.f-static.net/uploads/4476285/normal_603e7edea467c.pdf
    • http://kostlike.site/549680726572dh49.pdf
    • https://cdn.sqhk.co/xexisini/h8iiXje/jawapuxaxesagefaxov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e252bc5d-17c8-4068-a84c-8789859819ae/48815220118.pdf
    • https://uploads.strikinglycdn.com/files/c006e010-9472-448a-86c4-d84658855879/61233745683.pdf
    • https://uploads.strikinglycdn.com/files/ec1c2853-865d-4c1e-b31c-2fb440cfb424/butofaxalig.pdf
    • https://uploads.strikinglycdn.com/files/bfcc7a4b-9359-4932-9c3c-0ab6dae837bd/microsoft_visio_programming_flowchart.pdf
    • https://uploads.strikinglycdn.com/files/2fdaeef5-f2e4-436a-ae81-7e07721d97a2/theseus_and_the_minotaur_story_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/b87c9ac0-c2bc-4d25-8d93-8172beb3f547/xifomaxotemimif.pdf
    • https://uploads.strikinglycdn.com/files/d6c7ec84-ea6e-45e9-bc59-3372956069b9/what_are_the_three_principles_of_logic.pdf
    • https://uploads.strikinglycdn.com/files/af0bfe07-fa44-4beb-953a-1a3a6fb6ab65/41985388725.pdf
    • https://uploads.strikinglycdn.com/files/df49e69f-f6bf-440f-9b99-1a5dc2ef5c62/61712403523.pdf
    • https://uploads.strikinglycdn.com/files/b7669439-2143-4352-bff0-3448c4bb8628/52871052305.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109b6.bin
3331a309936f2016b16bacaa6a9236aacecfd5365728cb1011df70a9f86390e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109B6 5940 bytes

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