Malicious PDF — malware analysis report

Static analysis result for SHA-256 c933fac9fc8e847d…

MALICIOUS

PDF

70.7 KB Created: 2021-09-20 09:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35808c7d48d007daf10a4ecc57257f0c SHA-1: b211c1bbd7e3a87ff5097bad6aecf7ee8f29065f SHA-256: c933fac9fc8e847d6933ec90dcd11cc4442a1435735e1bbbd10c20c707b01547
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. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, indicating a link farm designed to obscure the final malicious destination. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic confirms this behavior, suggesting the document is intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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.
  • 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://indoshaolinkungfusociety.com/ckfinder/userfiles/files/gewiseduvozegojija.pdf
    • https://sieuthimaycafe.vn/uploads/file/zidibonovozopadexe.pdf
    • http://kingsfci.com/userfiles/file/19295136551.pdf
    • http://euroear.eu/ckfinder/userfiles/files/38501309844.pdf
    • http://kazuma.ru/ckfinder/userfiles/files/50608831871.pdf
    • https://minhkygroup.com/luutru/files/fitigonuvugiwi.pdf
    • https://kapokcmassage.com/uploads/files/202109111721284946.pdf
    • http://aelma.com/sites/default/userfiles/file/xelupidezujumozef.pdf
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/51061631861.pdf
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/najipilosexagawozuz.pdf
    • https://keluargamimpi2.com/contents/files/48417040005.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/or9n76fg281jj96c5esb3rpqns/97329545209.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/davibazovubepisugefejelir.pdf
    • http://saovietgroup.com/upload/FCK/file/34519359656.pdf
    • http://www.rify.us/cms-uploads/files/donujiditiduganus.pdf
    • http://fygl.net/uploads/file/120620346259.pdf
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/25511668328.pdf
    • https://j26clean.com/upload/files/rutum.pdf
    • https://nstoplana.rs/ckfinder/userfiles/files/rogimolitadokudafi.pdf
    • http://elitvorota.ru/f/file/lusujumuget.pdf
    • http://generaltubi.com/container/ckfiles/files/90218704139.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614604141fce7---67613954199.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=61+codons+for+20+amino+acids
    • 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_off0000b20d.bin
7d56e625ee8849ce6a2946c815d8a1473a9ddf180a73e4f3edc22bb200844207		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB20D 16700 bytes
font_01_sfnt_off0000dc99.bin
f4bab790ae947da7195f2894ec5ba80550b00776b6c62cb9df15fbd25990ba28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC99 10728 bytes
font_02_sfnt_off0000f544.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 16792 bytes

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