Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb4555ab9480691…

MALICIOUS

PDF

77.3 KB Created: 2021-03-17 17:42:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88086d462e5acffc1fb6d9133d6bee7c SHA-1: 1522744a68593f4ae743f6fd24511d4dde1db1a8 SHA-256: bfb4555ab948069128701f18f171fda109477bcdb6c0b4d40fbb902edb806a4c
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 hosted on multiple domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the structure suggests a malicious document designed to redirect users to a network of potentially harmful content.

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://dafemum.ru/award?keyword=antichrista+amelie+nothomb+pdf
    • https://cdn.sqhk.co/xawemubimaj/hgiBibN/mosebawebujadi.pdf
    • http://vepekideku.iblogger.org/90938677167.pdf
    • https://cdn.sqhk.co/nisikevepoxi/jeMWxgd/wazemivigibisarula.pdf
    • https://dizilezojo.weebly.com/uploads/1/3/4/2/134234798/362055.pdf
    • https://cdn.sqhk.co/fuvebopeweb/jgqjbjh/bunny_bookmark_origami.pdf
    • https://gupovokezatiku.weebly.com/uploads/1/3/4/8/134878629/luxeforupe-vojakitagapol.pdf
    • http://fortuneo-enligne.com/loluxuvekibub569zu.pdf
    • https://cdn.sqhk.co/vivokunavu/lji9cwI/goal_usain_bolt.pdf
    • https://cdn.sqhk.co/fexilejedit/fVJiejb/my_verizon_account_manager.pdf
    • http://bestgirl69.com/grooming_services_visual_basicmak03.pdf
    • http://goxosegeratis.22web.org/26615116535.pdf
    • https://nuzewotamomumaf.weebly.com/uploads/1/3/4/7/134701518/79f6d4f77fe25a.pdf
    • https://ginuwedisifixel.weebly.com/uploads/1/3/4/7/134744372/bezidimurezef-vuvuxewer-nosubumezus-musonukodexis.pdf
    • https://dunokosira.weebly.com/uploads/1/3/5/3/135349308/xamubuxuwekunin_sokikibuz_sovuwupenime_tezogi.pdf
    • https://lanoxujuzon.weebly.com/uploads/1/3/4/6/134630121/kugorezibozosel-lalovobibatu-rifidofivuwura.pdf
    • https://lugijuvumefabi.weebly.com/uploads/1/3/4/7/134761930/kixupalubadi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jenisozazewubo/nutasoj.pdf
    • https://s3.amazonaws.com/fedufiporara/nalituvufomumowulep.pdf
    • http://feramivo.rf.gd/62901780943.pdf
    • http://pijefekogol.rf.gd/46370365513.pdf
    • http://bopexetosezulav.rf.gd/challenge_full_movie_bengali.pdf
    • https://s3.amazonaws.com/sezebepit/ketudubat.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_off0000ee4a.bin
9f23683d9253767f1b6f3e11f9cc836c8077441304e8038f095ca209d16c0741		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4A 5524 bytes
font_01_sfnt_off000100e5.bin
19d2b1863d07d9f92a5bf26ec96462c998199271c4ae63c8cbbd697bcbfe4337		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100E5 11032 bytes

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