Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f521e1576e7f160…

MALICIOUS

PDF

85.1 KB Created: 2021-09-21 04:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e285f1f2fcbdb0e1b22541525dac3841 SHA-1: bce43798134a2de4364636187f6a3d647c4af25d SHA-256: 3f521e1576e7f160d71b4c00a374716d37857649e5d8b59d90422f4b7067abcc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The presence of numerous unknown URLs suggests a distribution or phishing campaign. Although no scripts were explicitly extracted, the PDF structure and malicious indicators point towards a likely attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://uptownfallschurch.com/uploads/files/merogepakida.pdf
    • http://umffz21.ru/admin/ckfinder/userfiles/files/97626723274.pdf
    • http://ateliergermain.net/sites/default/files/file/46158702366.pdf
    • http://medicapoland.pl/uploaded/file/20275619095.pdf
    • https://netwindowvn.com/uploads/userfiles/file/xirovokuki.pdf
    • https://bcbc3399.com/upload/files/jepolapegevowavefejagi.pdf
    • https://condominiovillage.com/userfiles/file/fopizozejalibodud.pdf
    • https://ryokanclub.com/FileData/ckfinder/files/20210912_F5430A1A1120FA3B.pdf
    • https://tavio.ru/files/file/ruvajo.pdf
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/nawidiwixixuzegamitug.pdf
    • http://hrt-foto.hu/_user/file/40552214661.pdf
    • http://kibbkw.com/uploads/file/61400442840.pdf
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/vufomipurokitefisiw.pdf
    • http://amandamaitland.com/images/file/gogemowevipadugulotatij.pdf
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/vapipasigizoraso.pdf
    • https://tucarrorentacar.co/ckfinder/userfiles/files/34324233603.pdf
    • https://servicenter.ro/ckfinder/userfiles/files/50497928952.pdf
    • http://hwayinn.com/image/files/20210906_015731.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa81aeb1a7---85605433677.pdf
    • http://dobermanncz.eu/files/3865826613.pdf
    • https://vinatech.com/userfiles/file/wuniw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=redmi+2+fastboot+driver
    • 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_off0000e4e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E7 16792 bytes
font_01_sfnt_off0000fcf9.bin
23f3d955923bc0032ad65ea20e6d613799988f94969cf3a75feafe1c1b13c378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF9 19216 bytes
font_02_sfnt_off00012e58.bin
ea50f735621f8a811a79b587d67647a6f98aa49a73fcdb3f8b898b0418a61cab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E58 10736 bytes

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