Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbb361e734aab44…

MALICIOUS

PDF

72.8 KB Created: 2021-04-10 16:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f65a3ec98113dcb10f4b9812f186ebdf SHA-1: 5369598e9e54d8a8ea4a4730c36360bfb6211f79 SHA-256: 0cbb361e734aab4434d313250b88df6efabfd2f024eae55ccba691e871dc75ad
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://maypoin.ru/strik?utm_term=why+does+montresor+seek+revenge+against+his+friend+fortunato+in+a+fit PDF link annotation
    • http://cpskras.website/bensalem_police_accident_reports33qq1.pdfIn PDF document text
    • http://wojournal.ru/liralaxibimifemufojbp64.pdfIn PDF document text
    • https://cdn.sqhk.co/zobazulibes/djf1dMA/kit_fc_barcelona_2021_dream_league_soccer.pdfIn PDF document text
    • https://kuwupixunipava.weebly.com/uploads/1/3/3/9/133986845/494607.pdfIn PDF document text
    • https://cdn.sqhk.co/jopuromug/dgdiaTv/guidelines_for_acute_pancreatitis.pdfIn PDF document text
    • https://vizexetu.weebly.com/uploads/1/3/4/8/134864552/duwinuduzod.pdfIn PDF document text
    • https://wixezijuni.weebly.com/uploads/1/3/5/3/135312108/3897212.pdfIn PDF document text
    • https://lijotabele.weebly.com/uploads/1/3/4/0/134016876/e6310.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xafamikipu.epizy.com/lepenoduturifo.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/nkjv_bible_large_print_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/mulawe.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/16310624877.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/97136692133.pdfIn PDF document text
    • http://zokuxoxo.rf.gd/susasarinarogenejad.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/thasha_avatharam_naa_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/wovaw.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/66237068559.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/brother_film_song_video.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/guilty_gear_revelator_ost.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_off0000dd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD09 5528 bytes
SHA-256: 365299085784894dfb03f4bbe6fea6064fa5275756b52791c4354b35a26560b9
font_01_sfnt_off0000efc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC1 10592 bytes
SHA-256: 14fad1725de81d194d048adf224f3f581e6934caf705d3875e08d9ba638ab663

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