Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da491651e2e5e24…

MALICIOUS

PDF

91.3 KB Created: 2021-09-22 19:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bedbb7f0009dd59f96796a8bc502aadb SHA-1: 1218e4762cd99e22ff712b9ea97ee0d264dfba64 SHA-256: 9da491651e2e5e24e5e6a59ec17e668c0064a89322aacca3eefaaad14c17eab3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://firegallery.ru/img/upload/kavesilamemizupebod.pdf In PDF document text
    • http://usefchina.com/uploadfile/file///2021091100283033.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/75835538094.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/66510857330.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/cde3971223da42b8a80edb37371d3ea2/44500868759.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/53020216584.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/98164845370.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/bowimimazem.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/difupopenixofute.pdfIn PDF document text
    • https://kar360.com/resimler/files/42768683822.pdfIn PDF document text
    • http://zenithmetals.com/files/tajibofiwikoxamanas.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/78342795276.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///78357401376.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16132fd3247d95---30691106451.pdfIn PDF document text
    • https://produse-zilan.ro/files/61173119580.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/7789132861.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/tatuzigoba.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/86144576176.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/ximisa.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/fewufavufoxaxurimopu.pdfIn PDF document text
    • http://ndfeef.com/radiant/mechimobiles/userfiles/files/40146114838.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/seximirumenitelawaronigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=new+movies+download+2020PDF 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_off00010310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10310 17152 bytes
SHA-256: 1d7c9957e416437c4a21b8fcdceacdf186c728393c03f4ce811c0956ac664b66
font_01_sfnt_off00012f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F81 10584 bytes
SHA-256: 11ac82cdfc408690e8065e15473a1e71feb48a95d8a08fcb73c80b57766845d9
font_02_sfnt_off000147bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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