Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c00c0e7ee9af42…

MALICIOUS

PDF

85.1 KB Created: 2021-09-18 06:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9fcd8d6ef73c2401730f3c20cc07dbe0 SHA-1: 029cbc064cfb4bdecceb6d6c9fd2dac3da909443 SHA-256: 81c00c0e7ee9af4219def7bfb6f77c413f863dd9364cce212e0f59238a82563b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. Although no executable scripts were extracted, the presence of embedded URLs and the overall structure point towards a malicious document, likely a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://camile.vn/wp-content/plugins/super-forms/uploads/php/files/vuh25ltc2eknhjdbjnu19ngg01/16523096063.pdf In PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/94326879849.pdfIn PDF document text
    • http://risme.vn/files/xofuzidifoma.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/78781479170.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3220243853.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/29721552520.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/71601156321.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/laxefupuzeb.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/kigasut.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/37699358971.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366709d345f---55871807385.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/85370671290.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/viregoledodalonuxif.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/sapaxemeg.pdfIn PDF document text
    • http://maksimetall.ru/files/fiwexawibunine.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/tebadib.pdfIn PDF document text
    • http://northcity.rs/slike/files/27580865068.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/91286547543.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/pimuxufolusumemitizup.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/16515391340.pdfIn PDF document text
    • http://evola.it/userfiles/files/43615108576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=cheap+bloxburg+housesPDF 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_off0000eae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE1 16856 bytes
SHA-256: 452193e0517b9ac16dd00dde6bbc51877728852c2db9c97216dc9df8d6521305
font_01_sfnt_off000116da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF1 10608 bytes
SHA-256: ea60882b1add0bc35ee665f1dbbad553d980d2e608c808c079db7c587208ce89

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