Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b23d2b642f90e5…

MALICIOUS

PDF

75.2 KB Created: 2021-09-16 10:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 76b8c65de5b96812ef0553358dcb1a2b SHA-1: 877b754e3445e605d6d2eb6ded0bba18a1b874d9 SHA-256: f6b23d2b642f90e5eb192fec975a9c5bfbe14b42ce6c7904aad2a880cb67fef8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV and ML classifiers as malicious. It contains embedded JavaScript and numerous external URIs pointing to disposable domains, suggesting it's designed to redirect users to malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links hosted on potentially untrusted domains, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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=action+blocks+apk PDF link annotation
    • http://cupta.org/userfiles/files/20210902141158.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/38131590139.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/75723009911.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/3687107241.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/tetasap.pdfIn PDF document text
    • https://termofriz.rs/files/medixi.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/sefemeteb.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/85088328610.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/takefomawi.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345c4187bf0---97787530576.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/wonidikipazaxizaxokapozoj.pdfIn PDF document text
    • https://educhina.mn/editor/files/jowosuxetenoj.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/runiviwirolitoka.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140102b95425---powetukaparive.pdfIn PDF document text
    • https://maviet.vn/upload/files/xisas.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210902_680FC7E4FD2DDC53.pdfIn PDF document text
    • https://lesura.net/userfiles/file/rotekuxe.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/faxosoxegumiwuwakofugowi.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/zetidenatumalojoforikijab.pdfIn PDF document text
    • https://oasis-travel.ro/files/24647411314.pdfIn PDF document text
    • http://lex.tj/img/file/16477612301.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/tomeramarimikomib.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_off0000c606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC606 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1D 10348 bytes
SHA-256: b45fbda463e3c90ecbcef912949b747c1a9da7dd1d97aa094341094cd5bc6f11
font_02_sfnt_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 16316 bytes
SHA-256: 8d816682b7436a10943dcbd983a080a8e7b6dcab99422ce46b948e3d9842c411

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