Malicious PDF — malware analysis report

Static analysis result for SHA-256 22484e61641e4980…

MALICIOUS

PDF

82.8 KB Created: 2021-09-13 15:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4b6d8b2ccc50c42fade3ad9581b7b1f6 SHA-1: 2d6ec3cd4fb547da6ff35e08efdf5b721efb41e5 SHA-256: 22484e61641e49805b1d9519da134e065aacfae101fa22751051ec6f589d6b04
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://inwebjor.ru/uplcv?utm_term=deadly+sins+retribution+codes PDF link annotation
    • http://lab4050.com/upload/editor/file/vovitemudinomujak.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/18920722980.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f9eb04bc1---tokagigud.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/lobolixukobis.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/82098287182.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/93863472053.pdfIn PDF document text
    • https://arendic.cl/files/37068971706.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/jalekodanamigumuki.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/94955074834.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/tudugivixujinez.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/74875441006.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/3702988125.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/wamunogabep.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f2138612---tekenezo.pdfIn PDF document text
    • http://gestioniarmatoriali.it/3156053105.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/fopapotem.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210909080637.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/rigopomi.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/99666358150.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/69975648027.pdfIn PDF document text
    • http://fjsxsx558.com/upload/files/22145163166.pdfIn PDF document text
    • https://trainova.com/userfiles/file/soxamegitizasapodadidig.pdfIn PDF document text
    • http://megalaserasia.com/upload///87631347806.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/57445744988.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/74354533112.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/89646775802.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/49914280967.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_off0000df06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF718 17600 bytes
SHA-256: b637276da712dc1172b417b1afa2824b4eb23b779421f42e8a3950cee7cb8464
font_02_sfnt_off00012520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12520 10716 bytes
SHA-256: a53544e1efeede9f22ded152d126c6ba05db14d9be5f741bb86da4d687e5357c