Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16b3d2371223e51…

MALICIOUS

PDF

85.9 KB Created: 2021-03-27 22:10:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f5b830ef20972e7bad6a759eed7f5af SHA-1: 1f2b221825cd88f89b838a4cdefb399de75826ab SHA-256: c16b3d2371223e51c59b159a9e61e3de800011565347d1ee744a60bb550b9651
154 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary malicious URL, 'https://soxebez.ru/award?keyword=assignment+abroad+times+newspaper+jobs+2020+today+pdf', suggests a phishing or scam attempt by disguising malicious links within seemingly relevant content. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8375

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://soxebez.ru/award?keyword=assignment+abroad+times+newspaper+jobs+2020+today+pdf
    • https://cdn-cms.f-static.net/uploads/4486994/normal_605ee57f0626e.pdf
    • http://fozurev.22web.org/67491917703.pdf
    • https://cdn-cms.f-static.net/uploads/4379982/normal_602f9772e0a7b.pdf
    • https://cdn-cms.f-static.net/uploads/4368266/normal_6040a8b1df7b6.pdf
    • http://bazodifufibi.22web.org/xaloferusovufulijisumate.pdf
    • https://cdn-cms.f-static.net/uploads/4444357/normal_60345b14443fd.pdf
    • https://cdn-cms.f-static.net/uploads/4475572/normal_6042162fda6a7.pdf
    • http://rutefozur.22web.org/anaconda_windows_10.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_eef80888d12a4ecd8c0e29c248f78276.pdf?index=true
    • https://03234a85-d811-4a68-a1f9-f7315bf9ccb2.filesusr.com/ugd/079591_18fc2eec5bb849669dfb7545677cee04.pdf?index=true
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_cd2879d0187046faa320b91587689017.pdf?index=true
    • https://uploads.strikinglycdn.com/files/59cc7bca-d6f3-450f-a494-d6f59c7596e4/44507486623.pdf
    • https://uploads.strikinglycdn.com/files/babb7746-8cc4-4d31-b089-baa3e50d71a7/frontier_fios_quantum_gateway_router_review.pdf
    • https://ac25a69f-a984-4293-9c3d-8c9e0f062535.filesusr.com/ugd/cbf077_a4e16e74097c4351806dec8818f781ec.pdf?index=true
    • http://roparewuna.rf.gd/pet_animals_pictures.pdf
    • http://nuwowafel.rf.gd/atmega32_datasheet_complete.pdf
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_57ec03bc06554915a3b68843f23d80da.pdf?index=true
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_1e7755242bf54ba3afb268112af99287.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012671.bin
27cbcb4d19385f96040d63e76a6a992110b8765b7b7d1b7f6ec3a2ab323d948a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12671 6004 bytes

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