Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d82156fb536ab4b…

MALICIOUS

PDF

77.8 KB Created: 2021-03-08 15:32:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 789697c4ac34e477782ce7e853ee43e8 SHA-1: 0c78d8b900384e2afd3694d8752070e751af8a76 SHA-256: 5d82156fb536ab4be5c3de223e32083f346f06c9fb9904bec5c1b6d11dd9dcea
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one pointing to 'soxebez.ru', suggesting a phishing or malware distribution attempt. The PDF's structure and embedded links indicate it's part of a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://soxebez.ru/strik?utm_term=cannery+row+monterey+opening+hours PDF link annotation
    • https://cdn.sqhk.co/sadirorig/jjy2iiE/31996681043.pdfIn PDF document text
    • http://fuckfrsky.com/130113314601ndu3.pdfIn PDF document text
    • https://cdn.sqhk.co/fovipobex/emhijfA/13987525737.pdfIn PDF document text
    • http://reliables.ru/narrative_essay_ideas_for_high_school5tmh3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371806/normal_5fc959a802e1a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390374/normal_5ff7cc4c6b811.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_602c5172b2220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383300/normal_6032c25457b42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448713/normal_603c2cf14de75.pdfIn PDF document text
    • http://stebsmeh.space/the_man_nobody_knows_summarydgvji.pdfIn PDF document text
    • https://cdn.sqhk.co/birugafomafo/Hphjgck/tanaga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7babe4bc-8f94-49e7-bffe-b09a1a07342e/360_degree_leader_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a8ce03e-1825-4861-a6c2-a8bed888df94/vegazoge.pdfIn PDF document text
    • https://729282ec-1290-4cbc-9302-cf8a24acd4c7.filesusr.com/ugd/42c189_3a17393c7a964a0db35d25a10d5951db.pdf?index=trueIn PDF document text
    • https://b6e49935-6d58-4bde-831f-6e0b746776d3.filesusr.com/ugd/7d321f_09686552eca44d4fbf8834878b6d5ac2.pdf?index=trueIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_418a62e0e6a346f283cd15bddc30cda8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff60b66b-1b18-4868-9d1d-aececf0d2fdb/nikon_d5200_price_in_bangladesh_flora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0c8201b-c992-4a4a-b966-a7782fa5b0db/logitech_wireless_headset_h800_mic_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b13d672-0e36-4334-b992-8fae0b643edd/9047853344.pdfIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_73caf3a6b1c84900af988fe9bf7f16c0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fda34eec-c680-47a1-911d-606a03eb377a/epictetus_enchiridion_greek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8285ee0-7b04-44d0-a821-17e883c5573b/75746392595.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14E 5300 bytes
SHA-256: eb6a3eae8a3e2ff27a48dc5a0544895ac0678cf9c131120ee1f192609f5f1202
font_01_sfnt_off00010345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10345 10976 bytes
SHA-256: 2ca897fa93b1898fba62655eec9575ad78aa87b37b1c2241fc0fdaa044050131