Malicious PDF — malware analysis report

Static analysis result for SHA-256 874508b8b92aec77…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 02:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 90ac29295c7257d141c1ea9c98fd2faf SHA-1: 5f4fb80c0a2e5e54a01c29c5e410e4336bb88f53 SHA-256: 874508b8b92aec77c4659e3b74b31889b43f90d0763ded75b11481600ea5015c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to unknown domains, and is flagged by ML classifiers and ClamAV as malicious. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the document's purpose is to direct users to potentially malicious sites. No scripts were extracted, but the overall structure and heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ibrahimkoc.com/images/Media/files/pazomunabaporo.pdf In PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/0b7285a4712ccf42d3bfb23b989863c3/kojevanobiduvulitoli.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/9552491655.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/begeweluwutosigafolo.pdfIn PDF document text
    • http://chamdure.com/DATA/files/wixitukuzo.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141421eccd50---xaduzetajopu.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210912041032.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/rebamobevapu.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/madisavimuket.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/31143040812.pdfIn PDF document text
    • http://come2menorca.com/images/file/90954862833.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/44143122114.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/fazenuvutazubemufedodu.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/57203297487.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/3505179539.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/jumofotisoronidabufopek.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/vebozigedidopega.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/vukuwinadop.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/26066249030.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/77125274553.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/sabewanevorakiv.pdfIn PDF document text
    • http://denge.aero/upload/files/83119406315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=best+football+flash+gamesPDF 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_off0000afee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEE 15780 bytes
SHA-256: b4747c566068c11902e25ed4825e6342c311e4b81832121150326a30625cea96
font_01_sfnt_off0000d830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD830 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF047 10560 bytes
SHA-256: 8d5671bde1b90c4b071bcf3c25286e5e75a3f991c1660a1e7f4d181ac1a7bfd1

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