Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d4a7012d1bf62f…

MALICIOUS

PDF

71.6 KB Created: 2021-09-16 02:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 13666f64f381786e9dd0f7271a0297b9 SHA-1: 42db1aae91e65bf919802f9ff313c8c70629102a SHA-256: 31d4a7012d1bf62f56d89c52041e4575e5b84a84a33e18a4fb837d8015729cfe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, suggesting a phishing or spam campaign. The ML classifier also strongly indicates maliciousness. No scripts were extracted, but the overall structure and URL distribution point to a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://archism.ru/uplcv?utm_term=john+wick+track+download PDF link annotation
    • https://domilot.com/uploader/files/mozimaxuwaz.pdfIn PDF document text
    • http://ucokampen.com/media/files/xokawalokonijorapev.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/28860600082.pdfIn PDF document text
    • http://mopron.ru/upload/files/fopitofexid.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/lofijinisab.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/kulini.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/zexopunemene.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/pavewax.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/83626619648.pdfIn PDF document text
    • http://avemkz.internet-match.com/upload/files/8999754248.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/zaxowo.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/72682852312.pdfIn PDF document text
    • https://rjpexport.com/files/73166232556.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/163109764194899660453.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/gezod.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/93313066729.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/sogurinifizofokulijesa.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/72177473177.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a15335773a---19160716561.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210906/file/16309416869001.pdfIn PDF document text
    • http://khlongtoei-nfe.com/library/userfiles/file/90339979664.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7c092b4b7---7577143373.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_off0000b705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB705 10336 bytes
SHA-256: 5cfe914a1d9ded85e167a73f9ed971043add617134fd93d39456f4f88e734b7c
font_01_sfnt_off0000ce5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66C 16880 bytes
SHA-256: 92d7cb6c35a041c0b50bfbe7a7bf51d2d76b66980e03a1cd797e420decf45101

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