Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9a3824e87a07b9…

MALICIOUS

PDF

98.5 KB Created: 2021-05-25 08:40:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3188b115d53c6af96777ec208fec7a13 SHA-1: 591f855da3d4e431dd931ff19269d8a76b581efa SHA-256: 8f9a3824e87a07b95a729f1e335c471c3d1f32cc6474edc1a23a1ffdb2164e65
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs with numeric slugs, indicative of a link farm or SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://leonvi.ru/strik?utm_term=centre+de+masse+exercices+corrig%25C3%25A9s
    • https://bimuxafidiw.weebly.com/uploads/1/3/4/7/134701061/fobobomugavibodisu.pdf
    • https://bowiromifax.weebly.com/uploads/1/3/4/6/134613330/fijetud.pdf
    • https://cdn-cms.f-static.net/uploads/4379032/normal_605c6e8e079c9.pdf
    • https://beluxavin.weebly.com/uploads/1/3/4/5/134507718/kizifefumale_wuwatak_fezol_pojoga.pdf
    • https://nametipij.weebly.com/uploads/1/3/1/1/131164318/gelubirodakibumelu.pdf
    • https://mepolelo.weebly.com/uploads/1/3/4/6/134626310/mipotiduxululineli.pdf
    • https://fofafobef.weebly.com/uploads/1/3/4/3/134349457/woxob-wiguwimiv-fuwezil-lopamofedaviv.pdf
    • https://vupimolafi.weebly.com/uploads/1/3/1/3/131398504/wokuwa_xebiv_zijenufafukax.pdf
    • https://cdn-cms.f-static.net/uploads/4393638/normal_600fd6522c6d0.pdf
    • https://cdn-cms.f-static.net/uploads/4419412/normal_600d91f8415af.pdf
    • https://cdn-cms.f-static.net/uploads/4485929/normal_604f8e7be7a89.pdf
    • https://mafoxoluz.weebly.com/uploads/1/3/1/4/131483222/4337950.pdf
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/koginepego-niwosuzeji-radebali.pdf
    • https://cdn-cms.f-static.net/uploads/4492573/normal_6019ad7d4d66b.pdf
    • https://cdn-cms.f-static.net/uploads/4386330/normal_602dd7b8e100c.pdf
    • https://bizotimugir.weebly.com/uploads/1/3/1/1/131164076/litajeb.pdf
    • https://cdn-cms.f-static.net/uploads/4497110/normal_6030cd928d875.pdf
    • https://zolalaroka.weebly.com/uploads/1/3/4/5/134591985/vikekoje-jikudopemuwi-pinorunegibopit-titup.pdf
    • https://garuvopu.weebly.com/uploads/1/3/1/3/131398288/tovodavozeruw-pusator-bunezegujez-lapedizelegud.pdf
    • https://cdn-cms.f-static.net/uploads/4405197/normal_603082cfcffa7.pdf
    • https://cdn-cms.f-static.net/uploads/4402032/normal_5fea146d5d45e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2c57b792-85eb-4c13-9ba0-69676d843b04/luparumufopidiluvogul.pdf
    • https://uploads.strikinglycdn.com/files/6533e08f-1f1b-4485-a593-02a459ae935c/votozebe.pdf
    • https://uploads.strikinglycdn.com/files/7b74e38a-9724-4105-84ab-8bbe431f886b/yoga_workouts_for_beginners_at_home.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001590e.bin
6b04c3090e9b6b9928f2a2cf77b55134caed69ec15399eb15c311f34a0e1987a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1590E 19624 bytes
font_00_sfnt_off00011894.bin
1388a67d1d0ef8046b6daf8a1ee97ca0e615b52d24ba71ed443e386c2f4673f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11894 5344 bytes
font_01_sfnt_off00012a60.bin
bed0d4e5990ac4569ae98e7a1dd2cd87559d4ca64112d2f841ec75bbd340cee2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A60 14700 bytes

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