Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5223e64e7ecb5d6…

MALICIOUS

PDF

75.1 KB Created: 2021-09-09 13:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eaa3427e96e655f6f42439bb21b84bfd SHA-1: 944e7dbcc467b554db3e33589263c764284b7433 SHA-256: e5223e64e7ecb5d610f3df96ce1127b19b841f9cb5813c3dfa37871ebffc89f6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Multiple external URLs were extracted, including one pointing to 'infrive.ru', which likely serves as a download or redirection point.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://infrive.ru/uplcv?utm_term=hsk+1+character+list PDF link annotation
    • http://altadirezione-consulting.it/userfiles/files/31117575023.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/kixixubew.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/99583044509.pdfIn PDF document text
    • https://xinpayflow.com/ckfinder/userfiles/files/71439402985.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/4014432685.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/xurelatukagiwuguw.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/24505592675.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/99219946707.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/rarurekodisobujutawajo.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/lulufuwurasenewapi.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/13119937870.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/30716102744.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/sewatobavelev.pdfIn PDF document text
    • http://rld-carbon.com/file/vebagavovulidefon.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210905_D00A39E18D511D66.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/xozevemodaweronutiso.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613186899e2fb---38889784706.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/50035171217.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/26412193653.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/jujotukipizuxomad.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/dl16gdcgjchqfntb6t4nvsnrv3/37468772268.pdfIn PDF document text
    • http://vit-physio.de/file/zifux.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_off0000b741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB741 10240 bytes
SHA-256: a02f5419a7154d32f81bd5838bb6097b098dd1e4f587323d8d3199eb330e29d1
font_01_sfnt_off0000ce67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE67 21956 bytes
SHA-256: cef483663aa80bc37a3a1c9eae142e15ae03ac23ce0a3f4b05e2c1ebb2eba1aa
font_02_sfnt_off0001075b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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