Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9efe51061e01958…

MALICIOUS

PDF

72.6 KB Created: 2021-09-24 17:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a9f397cf6426fe647bbd0bbeb8c9eb4 SHA-1: 7690fdae615300f0281855d915dcdc3a728b67a1 SHA-256: a9efe51061e019583289bbdb1bfbae5d10984d1a57abf39f0196023c2de1b353
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true malicious intent. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=android+install+apk+programmatically+in+background
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161465f9ef0b84---tunusujojuterotex.pdf
    • http://www.sm.ac.th/ckfinder/userfiles/files/62765135029.pdf
    • http://gatewayhotelbangkok.com/upfile_hotel/files/namokug.pdf
    • http://www.gyndoktors.de/ckfinder/userfiles/files/28049790307.pdf
    • http://cs-web-design.de/ablage/userfiles/files/botuxakedadira.pdf
    • http://es-manzokudou.com/yamituki-n/uploads/files/nedudadeluvijigude.pdf
    • http://bscsaoner.in/ckfinder/userfiles/files/sifelepikuvajabetegenufab.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff06bcb433---malobupe.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bcc44c51c---77392203231.pdf
    • https://confidence-ist.com/ckfinder/userfiles/files/40725589137.pdf
    • https://mr-alian.com/upload/ckfinder/files/dimuna.pdf
    • http://mlead.net/images/e/file/98057450196.pdf
    • https://millvalley.com/wysiwygfiles/file/kugekejanobijizazagemu.pdf
    • https://augsburger-dartliga.de/uploads/file/80500032737.pdf
    • http://pospatrans.cz/UserFiles/File/27067322684.pdf
    • http://studiotecnicomancini.eu/userfiles/files/91640438694.pdf
    • http://unite-chem.cn/upload/files/sotol.pdf
    • http://d2dgroup.net/upload/files/bibimazesusowiwu.pdf
    • http://munnartourism.com/uploads/file/18031593689.pdf
    • https://jagominum.com/contents/files/lasofekodum.pdf
    • http://www.recko.ru/ckfinder/userfiles/files/domodotubowomovasukumev.pdf
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/zakevavujevilejuwivof.pdf
    • http://smolninskayahotel.com/userfiles/file/katepekawuku.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/kivuketulaj.pdf
    • https://laatjehuisweerstralen.nl/upload/file/godesajuvesotomob.pdf
    • 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_off0000b538.bin
e4a883a996493b245dd966bf0b3c8c662401e76656f34849e92adf9ffe77e1ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB538 11152 bytes
font_01_sfnt_off0000cee4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE4 16792 bytes
font_02_sfnt_off0000e6f6.bin
9eccbd5e8dde6ebe35c2e9871cb2a99120315635f178c04033cce3d15e45c87a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F6 16948 bytes

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