Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41fa995b8e9e939…

MALICIOUS

PDF

68.0 KB Created: 2021-09-17 10:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07dcbdc28c966750cecf1b0f7c813c9a SHA-1: 225b209bc2c2d0edb848095ea1252adb084d392a SHA-256: a41fa995b8e9e9397a0a33af4fbbc6dc15616ba622919fd38cf99e3708698c0d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm structure designed to obscure the true destination. The presence of multiple unknown URLs suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://netwindowvn.com/uploads/userfiles/file/sodixob.pdf
    • https://at1apigroup3.com/contents/files/dekewupot.pdf
    • http://hotelbasantresidency.com/uploads/95476959673.pdf
    • https://rcvizovice.cz/ckfinder/userfiles/files/nugajubufepategedowogo.pdf
    • http://epmresearch.org/userfiles/files/fajogitanegizamitapodajaw.pdf
    • http://geo-equipe.it/userfiles/files/sirolaxobebero.pdf
    • http://ganteltechnology.com/system/userfiles/file/71729286238.pdf
    • http://lpsa.cz/userfiles/file/vebajarevusatejaraj.pdf
    • http://art-ball.net/files/file/42223070083.pdf
    • http://bedrucken24.de/userfiles/file/welujematikuragogavak.pdf
    • https://hunde-katzen.at/soubory/baberowifabazotikurile.pdf
    • https://retrofitoman.com/ckfinder/userfiles/files/24998036653.pdf
    • https://madeirashopping.com/userfiles/file/wiwolabam.pdf
    • https://www.aukuras.org/ckfinder/userfiles/files/77886786372.pdf
    • http://sangjeom.com/userfiles/file///zimemezavijanuxefe.pdf
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/tatosesekimurixageleposow.pdf
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/74883527072.pdf
    • https://jogamiskolc.hu/ckfinder/userfiles/files/lobufowidojaj.pdf
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/67828062353.pdf
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/wevis.pdf
    • http://thingsantiquesla.com/userfiles/files/pufawurolaxikif.pdf
    • http://heatexchangersolution.com/upload_fck/file/2021-9-11/20210911195758187807.pdf
    • http://vindindex.nl/images/uploads/26252492995.pdf
    • http://matsusushionline.com/uploads/files/98081288472.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=download+worms+3+android
    • 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_off0000af23.bin
ad8d7286fa767fdbb91a89c4ec850f6ab116a49577efc6506ce038496a1987c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF23 14252 bytes
font_01_sfnt_off0000d2d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D1 16792 bytes
font_02_sfnt_off0000eae8.bin
36013cc6b4a0d70123cfb593e77b1d546d80001f8727a19ae124413d679be7cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE8 10440 bytes

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