Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57882cee0cd36f0…

MALICIOUS

PDF

80.2 KB Created: 2021-09-12 18:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ce30a1776755db122e9afc23d24033a SHA-1: a5dcce78ea7a3cf30300b4c197b9298e3a314cb4 SHA-256: f57882cee0cd36f0d7ce7c3bb09e58e4e9ca38de90ca0ade55c8a77f71a3270a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to various domains, suggesting a link farm or redirection mechanism to deliver malicious content. The presence of external URIs and the overall detection as phishing indicates a likely spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=cheat+codes+for+gta+vice+city+apk+download
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a44b047c8---98041587288.pdf
    • http://dgxzz.com/uploadfile/file/72786930086.pdf
    • http://footstepfloor.com/upfiles/files/86058085439.pdf
    • http://perksys.com/userfiles/file/85420513025.pdf
    • http://rgn2u.com/userfiles/files/livonu.pdf
    • http://goodfortune.hk/UpLoadFile/file///47854957163.pdf
    • http://master-br.ru/img/file/57888828941.pdf
    • http://jan-fotografie.nl/upload/files/3832857763.pdf
    • http://odpadykj.cz/UserFiles/File/bavixedagabo.pdf
    • http://dailygiasi.com/uploads/userfiles/file/18436286667.pdf
    • http://tuanayapim.com/rsm/files/69366258889.pdf
    • https://kapefashion.com/files/files/45080571190.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d05a02259b---38131230632.pdf
    • https://iieng.org/editor/ckfinder/userfiles/files/99174023635.pdf
    • http://stagelight.pl/userfiles/files/87975446417.pdf
    • http://kientrucphatloc.com/upload/files/kuwewoj.pdf
    • http://rjbmachinery.com/d/files/62814175646.pdf
    • http://bscsaoner.in/ckfinder/userfiles/files/kiwok.pdf
    • https://braindevelopmentmaps.org/userfiles/files/soxenewu.pdf
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0901/ea3b462ef6feafb6011aa5387a0079df.pdf
    • http://hyundaiokla.com/uploads/files/95759558887.pdf
    • http://helloslow.com/data/userfiles/files/91663659614.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_off0000ceec.bin
b431d871e9d68ee616691c1dfc4d69526bd7a17b9470814c87d1c7bad629eb66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEC 18972 bytes
font_01_sfnt_off00010073.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10073 16792 bytes
font_02_sfnt_off0001188a.bin
66b755295f60352ed139e501ad946c52fdba6118102796da61681e17d8c26a7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1188A 11288 bytes

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