Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec58cdea651b529…

MALICIOUS

PDF

89.9 KB Created: 2021-06-01 15:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbaf06b18631ef8170fe94019c8d8b01 SHA-1: 02236e556ce354900c6f83fbd01e0fdf50adc19b SHA-256: cec58cdea651b5298dfbc7d8f094cfb64b4352e132fbcf2d59184eea390d38e6
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 pointing to Weebly and Strikingly hosted PDFs, indicative of a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6590

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://medvor.ru/pbw?utm_term=solomon+organic+chemistry+10th+edition+solution+manual+pdf
    • https://zobovakobazazu.weebly.com/uploads/1/3/4/3/134319401/nenesod.pdf
    • https://jikevumuvovidu.weebly.com/uploads/1/3/4/3/134324483/63272093ce0117a.pdf
    • https://cdn-cms.f-static.net/uploads/4457318/normal_606b773241847.pdf
    • https://sidusumidiwef.weebly.com/uploads/1/3/4/3/134366372/40b5b96.pdf
    • https://cdn-cms.f-static.net/uploads/4423429/normal_60663090cf120.pdf
    • https://cdn-cms.f-static.net/uploads/4414688/normal_6010f5cca9a86.pdf
    • https://sujujiga.weebly.com/uploads/1/3/1/3/131379538/5123608.pdf
    • https://cdn-cms.f-static.net/uploads/4381340/normal_600d32700b522.pdf
    • https://static.s123-cdn-static-d.com/uploads/4447086/normal_60b514b728e58.pdf
    • https://cdn-cms.f-static.net/uploads/4500186/normal_602a82f4e8928.pdf
    • https://cdn-cms.f-static.net/uploads/4391903/normal_60352099efefe.pdf
    • https://static.s123-cdn-static.com/uploads/4417213/normal_5fdfadebeaa4b.pdf
    • https://galixasuja.weebly.com/uploads/1/3/4/5/134518214/f64ead427.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://banusiv.pbworks.com/w/file/fetch/144453360/clases_biblicas_para_nios_cristianos_de_3_a_6_aos.pdf
    • https://uploads.strikinglycdn.com/files/066dfd0e-fa48-4013-803c-020a1e7869d3/18457889573.pdf
    • https://uploads.strikinglycdn.com/files/799a7db1-cd16-4a79-87de-340690b3f18f/wegorolamubovaxatiwejari.pdf
    • https://uploads.strikinglycdn.com/files/275543d4-8848-4466-8c1f-3d4374474fb3/87368993571.pdf
    • http://wuxikadafi.pbworks.com/f/33619255508.pdf
    • https://uploads.strikinglycdn.com/files/a4353120-b0eb-4b95-9370-5c306283b551/55101615302.pdf
    • https://uploads.strikinglycdn.com/files/767a2310-c045-446e-9542-0283dc9c3d20/ap_style_checker_tool_free.pdf
    • https://uploads.strikinglycdn.com/files/5d46398e-6a2d-43ad-8043-ae9b81f8ac76/how_to_read_after_we_collided_online_free.pdf
    • https://uploads.strikinglycdn.com/files/ea410ecf-528a-4e51-8358-723f909f69a0/is_it_legal_to_shoot_an_elephant_in_africa.pdf
    • https://uploads.strikinglycdn.com/files/d461b2e6-6535-4a2c-9143-e2caff89988c/what_is_stopping_phonological_process.pdf
    • http://wuvebag.pbworks.com/w/file/fetch/144427191/tepixagosituxozidamafuz.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014d97.bin
abfd2fd8c45e5a6939df85ff7b977649a7136331e72f6ad6be95eb000dfe4a9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D97 5848 bytes

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