Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c52eba80b5d1bd…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 07:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c49216a1978d46eb95fc2d37b93197a6 SHA-1: e6f093e049575d5e7c8762a213c890c60ce02b37 SHA-256: 17c52eba80b5d1bdd5c1f2cc86fdefa98d69de61bc32dd7be4250cbd47d1f0a8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on potentially malicious hosting. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://synerhu.ru/uplcv?utm_term=unlimited+message+send
    • http://ropesadventure.com/d/files/kewawonupupavamiw.pdf
    • http://skalamatbaa.com/userfiles/file/46970769008.pdf
    • https://ruxthai.com/ckfinder/userfiles/files/valerunumizugewa.pdf
    • http://cedule-plachty.cz/files/file/dipebifevagesope.pdf
    • http://mitroc.com/userfiles/file/29723009160.pdf
    • http://origo.ws/userfiles/file/55909585257.pdf
    • http://www.chatanakonci.cz/userfiles/file/figixore.pdf
    • http://inercial.es/uploads/files/kanoforalivuz.pdf
    • https://intrigantka.ru/images/userfiles/file/jogujujezegub.pdf
    • http://nessium.fr/userfiles/file/gikepevoloxuzi.pdf
    • https://aedwea.com/upload/foto/33178562156.pdf
    • https://webvitamin.vn/app/webroot/uploads/files/kuweloradijigov.pdf
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/nefesawolanuxuvabije.pdf
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/94842730748.pdf
    • http://www.horakgolf.cz/ckfinder/userfiles/files/lezakoworojur.pdf
    • http://k1a.ru/images/files/file/61713582018.pdf
    • http://lynxitservices.com/ckfinder/userfiles/files/85430281767.pdf
    • https://globalcircle.club/userfiles/file/laluga.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/brd1ievf8plplidiu97evfobf6/5139991547.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/lvf5pt7eu1favhe4je36vpaneg/75877571167.pdf
    • http://odontoflash.eu/userfiles/files/xidexapewigivugexa.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_off0000ccc9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC9 16792 bytes
font_01_sfnt_off0000e4e0.bin
03ebf72a385235a46236c18dcf53e281d125cda6c10cda1dae5335e2a7a455cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E0 10376 bytes
font_02_sfnt_off0000fc0d.bin
54bcb13dd96c9fabca45c6c19d14777404a0f94e584f3c4f16e66b021c4ab90b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0D 17104 bytes

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