Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1877e7895f9d2b5…

MALICIOUS

PDF

69.7 KB Created: 2021-09-13 19:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ee5dd6d2d9fc65ca80a791602083dac SHA-1: 1658654a741bb06673adb3eabc86901233e6ebc7 SHA-256: c1877e7895f9d2b53e77abd28dd131f9cef5c0e182cd1768c5aa0a8aafc135c6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and a significant number of external URIs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further malicious actions such as downloading additional payloads or redirecting the user to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/53453514195.pdf
    • https://protum.se/file/64776158488.pdf
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/31487169184.pdf
    • http://studiorumeo.it/userfiles/files/17855293071.pdf
    • https://k85shj16h-561lt.com/contents/files/bapidonijo.pdf
    • http://lagunaapartman.hu/images/user/file/74923555261.pdf
    • https://gulfsupremesa.com/ckfinder/userfiles/files/tavate.pdf
    • http://omeofest.eu/userfiles/files/50902517022.pdf
    • http://ueros.fr/admin/ckfinder/userfiles/files/68035641282.pdf
    • http://cuacuonanbinh.com/userfiles/file/64069042871.pdf
    • https://villadelauca.com/userfiles/file/18780615725.pdf
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/jelulalomasutuji.pdf
    • https://ultralloy.net/upload/files/50916390287.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161365ffa8d99a---78119899857.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135b75132a2b---tanedusaluvunogilo.pdf
    • http://cukiernia.eu/upload/files/favaxabotanusa.pdf
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/52733161242.pdf
    • http://bielwod.com/userfiles/file/22319567274.pdf
    • http://1544-7419.net/upload/fckeditor/file/porigon.pdf
    • http://esteel.my/userfiles/file/vamenumukubevavisopadabog.pdf
    • https://sua.vn/uploads/userfiles/file/20711282170.pdf
    • http://nhasachnguyenvancu.com/Images_upload/files/41377787911.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=gta+vice+city+game+download+for+android+free+download+full+version
    • 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_off0000b152.bin
6e0e3ff53eba93a8a4f7c6294697a7244042bc24e9c5b00bcbaa48d049ffa865		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB152 11224 bytes
font_01_sfnt_off0000cb8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8E 16792 bytes
font_02_sfnt_off0000e3a0.bin
e0b513de822e6af5a44810e749120879dc1dac526499f20ff61730750e90ec4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A0 14848 bytes

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