Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ccf53f76704e41e…

MALICIOUS

PDF

71.9 KB Created: 2021-09-16 15:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e2f8ca1999a34823fcad35a07990784c SHA-1: 0de4ea13531a2a97b8c02d0b9308f79fbeb498ca SHA-256: 9ccf53f76704e41e3b6b64c478b24db1e342b3569f9c6d7de448a9d2e8c7df15
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm as suggested by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The primary attack pattern involves directing users to these external resources, potentially for SEO manipulation or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://fullx.net/files/gukamidixuboz.pdf In PDF document text
    • http://propack-th.com/image/upload/File/jaraxixep.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/vufogedivitori.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/zawekisi.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/bikubopanonizuwakuvirog.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/fadunanapibi.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/77066903949.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/78877448357.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/47ce7723e4beb928d0100e54181f8038/28185062480.pdfIn PDF document text
    • http://planetamama.ru/files/file/zizabomenidunuzuzudexidob.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/dipepetuda.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/48319228825.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4592041443.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613894b00909d---31924886582.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/dixinemosuxil.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/tuvosirekuzalav.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/rixukeromijegetamumez.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/jumelagagofobenokewiso.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/mibutazefepokutod.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/garezuzo.pdfIn PDF document text
    • https://europartner2.pl/uploads/tafovederuvujise.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/wisifutatebuzibutugi.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/92861514768.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/fanirixorop.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/71375967350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=best+bangla+choti+websitePDF 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_off0000b45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC74 10688 bytes
SHA-256: dcab6c7bb2e2f3cfb551d2c3ec3597d67eb5da5f2bff65d6096d97689fbc70e5
font_02_sfnt_off0000e503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE503 17828 bytes
SHA-256: 6bf4a25f58a9914bdf3d6e79d5beedeb935d09bb30a012020ebc3e8c5dae6c1f