Malicious PDF — malware analysis report

Static analysis result for SHA-256 475ebcafb796bade…

MALICIOUS

PDF

83.4 KB Created: 2021-10-06 20:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5d15f2c36e126f5c140eecdefe5aedb4 SHA-1: 56e9d2519195ea0b6fbae9087f2c9e4564765677 SHA-256: 475ebcafb796bade5bb937a74a4cd1faad33a31655debf38082dd67c7a619497
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, indicating a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirms this structure. While no explicit script was found, the ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • 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 http://schubert-hh.de/image/file/30845124566.pdf In PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/31923700647.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/31399076379.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/0d22bf51571c74d47bc5752154fa50ff/bulewugemi.pdfIn PDF document text
    • https://arkadas.yuzuktr.com/eskortarama.com/resimler/file/47900647298.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/bagisifat.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/88789028030.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/ledalemibimugefuviv.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/18149826310.pdfIn PDF document text
    • http://kme-kme.cz/files/file/kifivetaralakab.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/40182529944.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139bb30261---16362536628.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/5442571137.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/fesenivusi.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/45351914629.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/61792882037.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/medabuk.pdfIn PDF document text
    • http://hijoin.hu/editor_up/wegabubatowabinik.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/14307295883.pdfIn PDF document text
    • http://kesifveotesi.com/files/31140017474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=tome+of+beasts+dndPDF link annotation
    • 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_off0000ddce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCE 19432 bytes
SHA-256: 0d7db2d3e82cac7d8c08a3ee7a3eed49bbc64413a0a47896e742ca2682ab8f89
font_01_sfnt_off000110c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DD 10380 bytes
SHA-256: 304858b31d57e76b38c3dd84ae31b3e56ec841abe2cb07a8876084f8ea17f674

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