Malicious PDF — malware analysis report

Static analysis result for SHA-256 af08aec5bd9c15c6…

MALICIOUS

PDF

100.5 KB Created: 2021-01-01 06:10:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 60d67442f612faa72283fa3956aa1187 SHA-1: 2e4a77d07d5cf179d132cbd3c35d3cbcebe8df74 SHA-256: af08aec5bd9c15c65849762dc8dfa94f884dd5e5e4054a8dbc671369fdb0d03f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on Weebly or S3, suggesting a link farm designed to obscure malicious destinations. The primary URL, 'trafffe.ru', is associated with a search query for medical prescription PDFs, indicating a phishing or scam lure. The ML classifier and ClamAV detection strongly support the malicious verdict.

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://trafffe.ru/123?utm_term=how+to+write+a+medical+prescription+pdf PDF link annotation
    • https://fimozafovobas.weebly.com/uploads/1/3/2/7/132741130/talalosozib-pudewisaxazasu.pdfIn PDF document text
    • https://jufukakoxojopop.weebly.com/uploads/1/3/4/3/134317893/7828251.pdfIn PDF document text
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/golewotesokixob.pdfIn PDF document text
    • https://xulasimij.weebly.com/uploads/1/3/2/8/132814518/tanuxamuxabidufod.pdfIn PDF document text
    • https://kosemarenile.weebly.com/uploads/1/3/4/3/134315061/davorax.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/ruzumeb/cv_xin_vic_mu.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/arqueologia_prohibida_libro.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/zinogesexoguberewagulupom.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/kakupejabubabavufularada.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/givefigilofivokoza.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/sister_location_custom_night_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/gibuzumavaruzelerisibevot.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/crush_the_castle_2_unblocked_games.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/battleship_mobile_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/pirezuxalafije.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000132a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A6 5356 bytes
SHA-256: 603bb283537dcb925b6c2228b327b5b4167fbf7308257b90cb8e7cf285f34d32
font_01_sfnt_off000144d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D3 11392 bytes
SHA-256: a6af67dbd69bd1c57dbf85a8f0c143d3bc0bd4046a0387cd979fe97de0889c29
font_02_sfnt_off00016baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BAA 17048 bytes
SHA-256: 2cbdb7a908bf8c1e7e9eca4a45c26d6ae7ec24a07d500d63a8acca804c5d3d4f

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