Malicious PDF — malware analysis report

Static analysis result for SHA-256 68eb68591d89c5ab…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 05:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac0e1a55a1aba1df963fd9414b0757ee SHA-1: 3b10af74e01d742f686f87df04849b35f50552e9 SHA-256: 68eb68591d89c5abd583bc819d849d97a5e1dc7c66f76db4c07770b3700c8156
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely serves to redirect the user to external URLs, as suggested by the PDF_URI and EMBEDDED_URL heuristics, potentially leading to phishing or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://deepex.hu/hirek/files/31247904496.pdf
    • https://aksusu.com/upload/files/25396746579.pdf
    • http://xn--80aesyq.xn--p1acf/files/file/nelenugelej.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/15816422778.pdf
    • https://www.scmsgroup.org/ckfinder/userfiles/files/gudenejulovofoxivoxigam.pdf
    • https://flomogroup.com/upload/files/61153210494.pdf
    • http://rcmo.ru/upload/files/tubimowiduragedodesogeso.pdf
    • http://1666-3668.com/attach/userfiles/file/wesutajiwulero.pdf
    • http://gptools.net/userfiles/file/pizejususesizu.pdf
    • http://muntepa.com/userfiles/files/90897526274.pdf
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/42663620378.pdf
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/kafuluruxuzu.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/5e93bbda13c76b846301a2f020879cd1/boguzunatogesuxuvetuwan.pdf
    • https://makenie.com/upload/files/bajenimulidabi.pdf
    • http://salman-group.com/userfiles/file/kidopebenogowilezaxulob.pdf
    • http://cn-biyoute.com/d/files/ribuvijafijojagowuwege.pdf
    • https://arkadas.yuzuktr.com/eskortarama.com/resimler/file/68579336128.pdf
    • http://avstralianature.ru/ckfinder/userfiles/files/26383582583.pdf
    • http://fiumevivo.it/userfiles/files/dagixu.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d29c96901d---69997960538.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=shakespeare+caesar+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_off0000dd8a.bin
27f5388769e238140846690696b4b568abfe2f5676d7f70843ed14c7199ee6a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8A 10424 bytes
font_01_sfnt_off0000f546.bin
8bb21694bc3a6ab89cd22cb2d69aff2ab72c96c67175b913073b0a0e0a24e21b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF546 17460 bytes
font_02_sfnt_off00012291.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12291 16792 bytes

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