Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f92bd99e6def0f…

MALICIOUS

PDF

68.6 KB Created: 2021-09-13 04:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0aec2911be7b4c384abbf5098eee47f7 SHA-1: 3aeee35f2a26fce0968918480ad993feb9fd56b7 SHA-256: 40f92bd99e6def0f30d05b0b30a625b5f25d71695a1c45e1e83b7cb9cad20430
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, with one URL being a disposable host. The PDF's structure and embedded content suggest an attempt to disguise malicious links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aire-limpio.com/img/editor/file/fimivolisodekopixaguz.pdf In PDF document text
    • http://sualpturizm.com/userfiles/file/xodofomesifedaded.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/sudaromabadomafako.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/95295328855.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/mozodorabipagubaguri.pdfIn PDF document text
    • http://synfarm.com/upload/files/81856266739.pdfIn PDF document text
    • http://topflexsports.com/uploads/89297839810.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/94578977000.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/48146838777.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/buzepemasakirufomosovoda.pdfIn PDF document text
    • http://dezis.ru/uploads/files/kalazuzuxikomiw.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/5c4d144647a45f784f2deb442e83bdc2/76260592618.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/bipovajobavadevevu.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/35061225337.pdfIn PDF document text
    • https://medpressa.ru/files/file/22705354091.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-6/20210906185304932786.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/90008753625.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e0be24c4dc881726d738dc58a056def9/35557434760.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/vojenowovixefejidol.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/88194225790.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/61998565128.pdfIn PDF document text
    • http://qwerty.pl/_data/file/vabuxagumaxefegenowu.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/71988216490.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/36080197162.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/22988697978.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/93320374647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=repeat+mode+androidPDF 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_off0000b12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12E 14460 bytes
SHA-256: 8793f88e77a92f5a33143f3857fe96a43ffe478c691b3baef3a710f396dc7b14
font_01_sfnt_off0000d55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55C 10384 bytes
SHA-256: 8503fcfd0a4a067d53035e6d9a3940d1e33978d1fff86cb5b82e60d89d1abe18
font_02_sfnt_off0000ecc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1