Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b2ba965fe67169…

MALICIOUS

PDF

75.4 KB Created: 2021-05-24 19:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb3d291a182a41307a6fcd2119c217a4 SHA-1: 27faac4a569a0260db14aeb0c9d25179a34bcce1 SHA-256: f7b2ba965fe67169525610144f199a9ea80777a47f1f169912fdec45099e27b6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO poisoning or to direct users to malicious sites. The primary malicious URL identified is zajinet.ru, which is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a trojan.

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-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://zajinet.ru/strik?utm_term=toyota+corolla+1997+owners+manual+pdf
    • https://cdn-cms.f-static.net/uploads/4459028/normal_60392a53e1ccd.pdf
    • https://cdn-cms.f-static.net/uploads/4380229/normal_6011fba32734d.pdf
    • https://vefamomapebimid.weebly.com/uploads/1/3/1/4/131406391/6777621.pdf
    • https://wafanipo.weebly.com/uploads/1/3/2/6/132695839/75ed7d3.pdf
    • https://kixovojowabib.weebly.com/uploads/1/3/5/9/135966002/3233837.pdf
    • https://cdn-cms.f-static.net/uploads/4474475/normal_60369c74a6f48.pdf
    • https://cdn-cms.f-static.net/uploads/4407788/normal_6065626114abc.pdf
    • https://cdn-cms.f-static.net/uploads/4366995/normal_6012dc2a52b9a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6e7ca367-0b59-450c-8ba3-a2801e194392/adjusting_trigger_pull_on_beretta_92fs.pdf
    • https://uploads.strikinglycdn.com/files/d1f968db-97b1-4454-85c2-a474952b0fa1/dimo_video_converter_ultimate_4.6.1_download.pdf
    • https://uploads.strikinglycdn.com/files/b907df87-5822-40f6-9df7-8e52db62374a/the_power_of_now_author_eckhart_tolle.pdf
    • https://uploads.strikinglycdn.com/files/d018972f-d3e1-4749-9243-047161f383c4/sch_power_vs_force_ebook.pdf
    • https://uploads.strikinglycdn.com/files/096bfe34-1012-476c-9ad7-ae7b097e6230/6679688631.pdf
    • https://uploads.strikinglycdn.com/files/69e2834b-0492-420b-974c-aaeaff536cca/duwix.pdf
    • https://uploads.strikinglycdn.com/files/593962b2-488a-47e5-b4b6-1296bd607ca9/kukizagakerifetagefi.pdf
    • https://uploads.strikinglycdn.com/files/c5af2e50-a0fc-426d-9a20-95b2be343720/77379849058.pdf
    • https://uploads.strikinglycdn.com/files/e4b24502-8008-4832-a669-9cb3e1043fd1/fofujedetijojubikexabe.pdf
    • https://uploads.strikinglycdn.com/files/4fbab00b-5915-4655-bac8-52623394ccf9/72785767658.pdf
    • https://uploads.strikinglycdn.com/files/a92eac7d-ae66-4e2d-8503-a28815375307/beethoven_violin_sonata_10_program_notes.pdf
    • https://uploads.strikinglycdn.com/files/a2d0a6a4-e433-4c22-8750-c72d9a57f463/kumajibifubuz.pdf
    • https://uploads.strikinglycdn.com/files/0f10cff9-3874-4bf4-a0c9-b9130d1af0f1/how_much_are_tamales_at_el_pollo_loco.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_off0000e9af.bin
937ec75a5431ce653d60bd98adedd88639e15b51406dba91e7d8643dcbee1333
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AF 5732 bytes
font_01_sfnt_off0000fd46.bin
9d8efbc1c54831c20de29299f9fb7068b9acf636544ea914e9cb8ccf48363f09
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD46 10284 bytes