Malicious PDF — malware analysis report

Static analysis result for SHA-256 6478d98845c19c53…

MALICIOUS

PDF

73.6 KB Created: 2021-09-18 08:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2d8b9cfc84339b4b63c4aa7089242573 SHA-1: 29905c5b0017cc8e3c88d9871a5c6c927d20ebe3 SHA-256: 6478d98845c19c5360de16756f1fa3204a4247c9fa681e229f20edc8bc83e60e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=words+starts+with+letter+p PDF link annotation
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/ginadumowakatanitixax.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/70422627995.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/81284002103.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/sitagasozamemedixoroxaj.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/59825575065.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/91287767139.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/8436610711.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/gigamuzebuforidavewumu.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/jufoko.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/90108216353.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/76450229131.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/tuledoraxuvusebaxazuxas.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/nogirafudaveg.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/nawirewakiwabolip.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/dopiguxavu.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/73519031772.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210904_82597C0B716E00A9.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/13844630091.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/varemipiberizexobaxemalu.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdb8fd884d---96540851014.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/93066499400.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/mobifalokoperibuv.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/kegenulesisofase.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD349 17272 bytes
SHA-256: be1518daf6f674075cd9dd457660a6ce184d3f6c72e6bbfda971f65d5ed5b95c
font_02_sfnt_off0001009e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009E 10464 bytes
SHA-256: 2273313802f3c1e28c0cdcc45eae30a006fc497a91f8193cea23cdb25e213c6c

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