Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3c44d795096ff5…

MALICIOUS

PDF

78.0 KB Created: 2021-09-16 04:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c3ddf3c755d821a3d09ec212adc4d62c SHA-1: 0462e312e7a79996e3856f22b19cdbed1ae7677c SHA-256: 2d3c44d795096ff5164125f7ab4e29b0f8417ac12420b74fe9ab9149b574c592
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final destination by using multiple distinct hosts. While no scripts were explicitly extracted, the presence of external URIs and the overall detection profile strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://allytemp.ru/uplcv?utm_term=the+secret+doctrine+pdf+free+download PDF link annotation
    • https://gilbertems.com/videos/file/622894745.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/98894624057.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/39771925358.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/90740545438.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/38287249682.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/69014293974.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/92870439483.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/98980783207.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/70712145774.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/82349856085.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/84318042818.pdfIn PDF document text
    • http://ceroki.com/image/files/fevolufabofako.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/fudivesume.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/nagularatumemeruditasiv.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/lemagonunujab.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/73751967680.pdfIn PDF document text
    • http://njxinbell.com/upload/files/81224521541.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/rikejegulolelowipibawux.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/8t0jeseah623lnmd2eknspubco/79754959135.pdfIn PDF document text
    • http://hangquangauto.com/files/82728959357.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/75354308129.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/pufonorijevabemugu.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/edb0d565ae3596c3e618651d1a877304/37374895063.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/nokojorifufabi.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_off0000c49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49F 10768 bytes
SHA-256: afb16b2195ebe0cd87e91bd723dddd90d58163b1649395bebbf3b33a3cbd1c8c
font_01_sfnt_off0000dd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD68 20160 bytes
SHA-256: 03b9aa09ca6e13c7b7536a4a905f473578f9d610dfb3933cab9f73fdbc368ff7
font_02_sfnt_off0001127f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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