Malicious PDF — malware analysis report

Static analysis result for SHA-256 5166c8d63f122bc9…

MALICIOUS

PDF

79.8 KB Created: 2021-09-13 07:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec4098976210d67ad35119bfb57302f0 SHA-1: de44bc39a6913a161c2580ed0c912412348997d0 SHA-256: 5166c8d63f122bc9b517abc16cbc9fb6481865a785438cfe3d8c9e367f981bc7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to disposable domains and form a link farm, a common tactic for phishing or distributing further malware. The presence of these links suggests the primary goal is to redirect the user to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://szyoujin.com/UploadFile/file/20210903055604402.pdf
    • http://bygreenpure.com/userfiles/file/befiwarow.pdf
    • http://klubalfa.org/img/userfiles/file/nefonegidemixaralumod.pdf
    • http://holzbau-napetschnig.at/44126380387.pdf
    • https://daquin-ferriere.fr/userfiles/file/94582352106.pdf
    • http://www.sec-ollivier-associes.fr/www/upload/file/75333595923.pdf
    • http://agedwedfjtj.pretty-match.com/upload/files/83615187581.pdf
    • http://scarpatti.com/files/91563475124.pdf
    • http://paradoxine.com/upload/files/48577312398.pdf
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/79710872147.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/adbdbfb6831a8945f28e3fc9270cf3bb/bovabuvekefirolulope.pdf
    • http://hoya-system.com/uploads/files/202109042250245695.pdf
    • http://nutricount.cz/UserFiles/File/zabilixokodivoza.pdf
    • http://kochamsushi.pl/UserFiles/file/5772771274.pdf
    • http://www.centralperdana.com/file/66828369889.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130232428f88---tovudajoxakov.pdf
    • https://mtydizayn.com/userfiles/file/74722282686.pdf
    • http://citra.cl/userfiles/file/didab.pdf
    • https://rowsontw.com/shopadmin/upload/files/41773802115.pdf
    • http://kondicionery-domodedovo.ru/upload_picture/file/47169190424.pdf
    • http://goraku-sangyo.com/userfiles/file/xufomulup.pdf
    • https://canoe.ro/Extras/ckfinder/userfiles/files/10876655263.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+cast+phone+screen+to+pc
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d567.bin
10d180b4906af10804d4706300021d8962b97e6e7d95ff12fd15007818cb3d7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD567 17144 bytes
font_01_sfnt_off000101d3.bin
5ba05cd2e6904652fd18901c4d8bf3021aff684ee58e899ff77156eb36750710		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101D3 10412 bytes
font_02_sfnt_off0001196d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1196D 16792 bytes

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