Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd3d0922f94fe72…

MALICIOUS

PDF

70.8 KB Created: 2021-09-28 00:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6d9e89497e654bf1ceabc36b941a1185 SHA-1: d0b693ee1ce4acd3923f94b6a3391c1c9e148320 SHA-256: dfd3d0922f94fe72a48c7226e05663c61bc07dabd22c49c2c12ceeeef64ddc0b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct hosts, which is a common tactic for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://tuvanthanhlapcongty.biz/upload/ck/files/28167375902.pdf In PDF document text
    • http://bebaldebaran.eu/userfiles/files/8682146022.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/9769137284.pdfIn PDF document text
    • http://holzbau-napetschnig.at/10078258724.pdfIn PDF document text
    • http://web5gstore.com/Files/files/2523541519.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/venag.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/dozisonevirubivelenozozes.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/vokosobitedovazuji.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/61890121776.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/zugibirufoxujud.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a3f26e6f24---60402639459.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/98794376435.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/dufofotuwa.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/965635231201630720157.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140933cc4c74---30582148131.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/dupidurev.pdfIn PDF document text
    • https://bloomeng.com/uploads/vabiguxogazener.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/26224348637.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/64669798783.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/43506292730.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/zizaz.pdfIn PDF document text
    • http://sgrdpandher.com/userfiles/file/zuputure.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/xikiwezowaxosove.pdfIn PDF document text
    • http://standardamulet.com/files/files/firuwejegap.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/rufanomodevum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ragnarok+offline+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_off0000b197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB197 10400 bytes
SHA-256: 6af5e2127af2fd4e8d4bd4edc319c323d1d3100d74618fc080fd49daa0273538
font_01_sfnt_off0000c8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F6 16724 bytes
SHA-256: 6ac3511c103e2b97a96380097b65d33a7fe6c46e549dac48d17fcb90d46f7dfb
font_02_sfnt_off0000f424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1