Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf62a8f710f1734…

MALICIOUS

PDF

85.0 KB Created: 2020-11-10 07:58:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 3268557498b42c7f09b97fbb940cbe6d SHA-1: daa94281cd519f1d07d10059f1d9bc3d8c90699d SHA-256: 1cf62a8f710f1734c5b8ef34d85565420b2ebd25b1fb4bdc4d2138018fc9389f
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating it is part of a link farm, with numerous external links. One prominent URL, 'https://trafffe.ru/aws?keyword=pokemon+x+and+y+randomizer+rom+download', suggests a lure to download game ROMs. The presence of ClamAV and ML classifier detections, along with the PDF_SEO_LINK_FARM heuristic, strongly suggests malicious intent, likely to distribute further malware or engage in phishing. No scripts were extracted from this sample.

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 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://trafffe.ru/aws?keyword=pokemon+x+and+y+randomizer+rom+download PDF link annotation
    • https://rapexinet.weebly.com/uploads/1/3/4/3/134328854/ruvoganogukij-kosoxelo-bodelufuwix-nepufeson.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nitatotol/employment_termination_form.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/tafegaremapokaxuma.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/rixugadinemozurezemaf.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/snappy_trap_for_double_kitchen_sinks.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/logic_games_workbook.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/que_es_un_fideicomiso_familiar.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/8505191304.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/instructions_form_8949.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/29214498746.pdfIn PDF document text
    • https://s3.amazonaws.com/kidugodofunose/pefuvo.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011826.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11826 27416 bytes
SHA-256: 5d988aabd37b3de17e0b40fe47bc756fed25ec65e81f989d2a44471c4533b02a
font_00_sfnt_off0000dff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF1 5172 bytes
SHA-256: 880889921c1d67650f7730fda7c9da69e7e4a0ce07767d36183166c6c3a411ae
font_01_sfnt_off0000f197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF197 11204 bytes
SHA-256: f4a8913a42d67dbce6a488aebf95f13d254c4dc4948a8f437ffc91284c9fe0e7

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