Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb13654dd452f8da…

MALICIOUS

PDF

84.0 KB Created: 2021-03-02 05:44:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6b973c3837781d8bc54f1489b45441b SHA-1: 84dc2c3ec8bc4351ed75aa0c4bb6c82cf17f73bf SHA-256: eb13654dd452f8da6d6180473d039f5620a298dd1c09a160e46e3908b203fe71
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to various domains. The ML_NYX_PDF_MALICIOUS and ClamAV detections confirm its malicious nature, with ClamAV specifically identifying it as a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/123?utm_term=the+new+adventures+of+sherlock+holmes+60-episode+set
    • https://cdn.sqhk.co/fularulojoze/jchhjiR/mevoxutap.pdf
    • https://cdn.sqhk.co/lukisebeka/XOSjeHn/sad_video_status_download_telugu_share_chat.pdf
    • https://bawokopo.weebly.com/uploads/1/3/1/0/131070727/53d4c3070.pdf
    • https://kixuvatapowow.weebly.com/uploads/1/3/1/3/131383305/9836114b94478.pdf
    • https://cdn.sqhk.co/zozimevoket/dihihhh/sobagejoriju.pdf
    • https://cdn.sqhk.co/gixotagokezu/PG6sYge/boxhead_zombies_game.pdf
    • https://bexopugizabon.weebly.com/uploads/1/3/4/0/134042324/5366591.pdf
    • https://kijabejinal.weebly.com/uploads/1/3/0/9/130969506/pisitemorifa.pdf
    • http://xifuponek.iblogger.org/19040467227.pdf
    • https://cdn.sqhk.co/fokivetezabu/hjhdbrE/female_halloween_costume_amazon.pdf
    • http://seviregigaguz.22web.org/bseb_intermediate_result_2019_marksheet.pdf
    • https://vejuxafesopekub.weebly.com/uploads/1/3/6/0/136010302/wiguf.pdf
    • https://vejikawotepux.weebly.com/uploads/1/3/4/8/134887167/868ad.pdf
    • https://zobigitesi.weebly.com/uploads/1/3/4/6/134691723/ridaxalilujibupon.pdf
    • https://mugevodotigo.weebly.com/uploads/1/3/0/7/130740084/2618128.pdf
    • https://tijesefufejeje.weebly.com/uploads/1/3/4/8/134858706/zovabo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://turepebixorara.rf.gd/benji_bananas_game_for_pc.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_off000108f3.bin
dabca0bd574080ac9752e7998fc18776be28795247f0f2aef2b5fc1af38c7757
pdf-font-stream PDF embedded font (sfnt) at offset 0x108F3 5888 bytes
font_01_sfnt_off00011cf5.bin
cf939ab9350b47b78d795392fdaf3eae2bb3e158dbd0cda9a41ffcee708c9ab9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF5 11644 bytes