Malicious PDF — malware analysis report

Static analysis result for SHA-256 918247b34eb3c738…

MALICIOUS

PDF

84.8 KB Created: 2021-09-12 01:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: af46b9b6d3b45ea5aced6fc1d640f2f8 SHA-1: 820d09fd3410c170bfdae55347c35f5e07f1da77 SHA-256: 918247b34eb3c7384e07ebbd38f271b4c04987cf908e3738d55678a47ad5abe3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a tactic to distribute malicious content or phish for credentials. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://bakefruit.com/uploads/files/202109070136158802.pdf In PDF document text
    • http://vetportonaccio.it/userfiles/files/dekokezowulewurifofadefot.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/3270145523.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210909_B5A36E29968CAF78.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/2911408176.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/dovapiwumegir.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/2263985752.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136d80e6b2e7---23962440429.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/75487716056.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/wejatizijovamujevonabu.pdfIn PDF document text
    • http://vit-physio.de/file/14858526196.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/24754399443.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210909124701.pdfIn PDF document text
    • https://podimercrm.com/img/files/fisufonako.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/4696763053.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/kawalofuzerubifip.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/rodopomekofazajusivotatep.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/84991412415.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/33185708735.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed6ce7d170---mikatizomakotivibebelesan.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/sejel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=best+book+to+learn+c+language+for+beginnersPDF link annotation
    • 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_off0000e5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BD 17920 bytes
SHA-256: 3044538f4db4a976d7d797964e66d46bc50549690fdf647cd9ac8cefabf78fa8
font_01_sfnt_off000113d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BED 10896 bytes
SHA-256: 519dd0d46c3cca840c8572febd62f71756793349c89ccb04f516565d1b8f1ae6