Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f8ac30f547101e…

MALICIOUS

PDF

67.9 KB Created: 2021-01-11 10:01:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0a2b1a0d1bf7d8749c20d0634cbfeed9 SHA-1: 7dc1f4f1c25701d7fda7b32e137b14efd7649266 SHA-256: 25f8ac30f547101e625e1ea16cdc1f44a10b6336e1549ed1e54f2ec06303a3c3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a PDF link farm. It contains numerous external URLs, with one pointing to a suspicious domain ('traffine.ru') and another to a PDF file on an AWS S3 bucket ('xilasisefi/xajedobapu.pdf'), suggesting a potential phishing or malware distribution scheme. The PDF structure itself appears to be generated by wkhtmltopdf, and the presence of embedded URLs indicates an attempt to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/aws?utm_term=bharatanatyam+steps+pdf PDF link annotation
    • https://cdn.sqhk.co/vitozogog/Ahc5zii/word_blitz_game_rules.pdfIn PDF document text
    • https://site-1178836.mozfiles.com/files/1178836/48808290628.pdfIn PDF document text
    • https://pesawuzopedeg.weebly.com/uploads/1/3/5/3/135327269/jiduwilid.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/2P4jbiZ/geometry_dash_subzero_hack_apk_mediaf_re.pdfIn PDF document text
    • https://site-1166616.mozfiles.com/files/1166616/25932159533.pdfIn PDF document text
    • https://degemojo.weebly.com/uploads/1/3/1/4/131407655/5791160.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/xilasisefi/xajedobapu.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/joxovakigowenegejik.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/chaumont_bay_ice_fishing_guides.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/70677824401.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/borixudaruzomo.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/yikes_crossword_puzzle_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/88238136834.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_off0000cf7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7D 5400 bytes
SHA-256: 28f649afaf1213cd5e5df2413cfd8d6d1836b923cd393136d159c5fd7c9e47e0
font_01_sfnt_off0000e1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BD 9800 bytes
SHA-256: df5ef55226302a9faf17fadc208da6acec5d7189d3dba3964dc42ee565be375f

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