Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee7b0cbcfc9e479c…

MALICIOUS

PDF

72.9 KB Created: 2021-09-09 14:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 402d3d6e08c7c26b51207c5eed387844 SHA-1: fb445cfa8147d6253a37010bba6d5633998a4c78 SHA-256: ee7b0cbcfc9e479c4ee8e4dc797abbf6a04d93af905877626afa50f8caeb5807
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of embedded JavaScript and a large number of external URIs, many pointing to disposable domains, strongly suggests a phishing or malware distribution attempt. The embedded JavaScript likely serves to further obfuscate the malicious intent or to directly execute further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=teach+yourself+complete+thai+pdf
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/89960291944.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fc6aa1f8619bd56c0ccd4dd0e567bb11/64162868640.pdf
    • http://www.uc-kushiro.net/images/library/File/63580845433.pdf
    • http://gryfarmerskie.pl/pliki_wyswig/files/15019325840.pdf
    • http://kondicionery-domodedovo.ru/upload_picture/file/niwojegazigib.pdf
    • http://domesticsolutionsagency.com/userfiles/file/vafozekafej.pdf
    • https://thietbidiensino.vn/media/ftp/file/30510867156.pdf
    • http://onishi-kyosendo.jp/archive/74691881808.pdf
    • https://lecourbe.dk/userfiles/file/92409086482.pdf
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/41961446245.pdf
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/zavetumogumez.pdf
    • http://topstec.com/d/files/pitoxepakerilovuxixure.pdf
    • http://marketypik.pl/zdjecia/fck/file/56357238974.pdf
    • http://sun-tes.ru/files/file/40739418252.pdf
    • http://sial.pl/galeria/file/12537981642.pdf
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/jasebejopelap.pdf
    • http://jdjcnc.com/upfolder/e/files/20210905142132.pdf
    • http://thuonghieutoancau.vn/uploads/files/49750849290.pdf
    • https://kheops-so.fr/ckfinder/userfiles/files/96577866051.pdf
    • http://cerritos.songhakbbq.com/uploads/files/gukolujuraxelaluviwud.pdf
    • https://duproject.com/uploadEditor/files/46538199548.pdf
    • http://cga82.com/admin/File/4169599816.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_off0000b86c.bin
334b8e4a11d8034f577d72d4c4b8a57fe35631a1ea1e9903594a114cab303f16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB86C 17052 bytes
font_01_sfnt_off0000e433.bin
78e689eb8f30087ff197151d0ce26827a5303b84956ee3bf2cae0f1503af8462		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE433 10956 bytes
font_02_sfnt_off0000fdae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAE 16792 bytes

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