Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d5791d0f8beca00…

MALICIOUS

PDF

74.0 KB Created: 2021-03-20 00:15:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8de60b71d9f7c4bfacd2e9cde940ae1 SHA-1: b9cb5a4e6e40e4d4cca7f714e4fcd42743e122eb SHA-256: 0d5791d0f8beca00e4e04c8a4e09c1d83acd2673547fce3e0832bdd8258a6008
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of these links, https://dafemum.ru/123?utm_term=ap+calculus+ab+review+sheet, is flagged as an external URI. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through this link farm. No scripts were extracted, but the PDF structure itself is used to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=ap+calculus+ab+review+sheet
    • https://static.s123-cdn-static.com/uploads/4476930/normal_5ff5f84b06f6c.pdf
    • https://puwulafu.weebly.com/uploads/1/3/5/3/135329465/bofupexoduwo_zaxak.pdf
    • http://lnstagramcopyrightmanagement.com/mijenumebejewumakuf9lly.pdf
    • https://cdn-cms.f-static.net/uploads/4462976/normal_6019d93c47d86.pdf
    • https://xosofanukofupa.weebly.com/uploads/1/3/4/8/134879033/garel.pdf
    • https://puxajibixitukus.weebly.com/uploads/1/3/4/4/134457664/biperomurarifu.pdf
    • http://speak4pro.com/occupation_2._5_mod_apk_2._2._1b63ox.pdf
    • https://cdn-cms.f-static.net/uploads/4486344/normal_6054327c3d541.pdf
    • http://zhigina.ru/soundlogic_xt_manualtyi7x.pdf
    • http://granitmetrospecstroy.ru/texto_argumentativo_expositivozlf64.pdf
    • https://saxesejidor.weebly.com/uploads/1/3/4/6/134694827/kamexakoxobep.pdf
    • http://dektesheff.xyz/11251694066gm2h2.pdf
    • https://cdn-cms.f-static.net/uploads/4443809/normal_60160e0ed41dd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/novipaliwid/best_arabic_music_2015.pdf
    • https://s3.amazonaws.com/dutimajizowa/marvel_future_fight_character_progression_guide.pdf
    • http://juwovumul.rf.gd/namapuzovoxiguregute.pdf
    • https://s3.amazonaws.com/fosalizuzu/mijofeser.pdf
    • http://nerofote.rf.gd/2005_honda_odyssey_transmission_rebuild_cost.pdf
    • http://xewowetakefov.rf.gd/que_es_un_proyecto_de_investigacion_cientifica.pdf
    • http://guduzexotozi.rf.gd/46720365801.pdf
    • https://s3.amazonaws.com/musoxifuvitalo/vunepadupazofeboxobebe.pdf
    • http://nerusejide.rf.gd/most_beautiful_html_templates.pdf
    • https://s3.amazonaws.com/gedexim/pogalasuferetose.pdf
    • https://s3.amazonaws.com/likerajatob/42417338108.pdf
    • https://s3.amazonaws.com/dobikasukavu/calendario_mundial_rusia_2018_hora_mexico.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_off0000e603.bin
7869b20666a57ca08461d43fe029faa7ec54ff1462d04cde97c323b3983ff5ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 5304 bytes
font_01_sfnt_off0000f815.bin
8df931eff66f6704b65c479cf7ee0c867c7e959640236df4315870d11fb6fc40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF815 10196 bytes

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