Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45e84de12a2794a…

MALICIOUS

PDF

72.5 KB Created: 2021-09-25 03:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f64e8a92ba7f276a38d72e5254efc237 SHA-1: 07a5835ddbbca85a1ab095cac7a643f627dbf3b3 SHA-256: b45e84de12a2794a14fffcfb9d2210145b4761f184e003f0a1e519a2ecf0404d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs suggest the document functions as a link farm, likely directing users to phishing sites or further malware downloads. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to facilitate these malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=free+lsu+ringtones+for+android
    • http://wmc21.com/ckupload/files/moxitovagedanegiligizem.pdf
    • http://custom-mugs-factory.com/uploadfile/files/95960786862.pdf
    • https://cvssteelex.com/ckfinder/userfiles/files/17380481526.pdf
    • http://tpdw.pl/userfiles/file/pinigumalixe.pdf
    • http://re-media.ru/foto/ck/files/48695196460.pdf
    • http://udaybharat.in/ckfinder/userfiles/files/61849142394.pdf
    • http://theartofdesign.nl/ckfinder/userfiles/files/6887070577.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161452a2a4fb51---juguzi.pdf
    • http://copy2d.com/ftp/image/file/42060880356.pdf
    • http://canoeing.by/pics/files/jukukowefonefiduboka.pdf
    • http://crabandclaw.com/uploads/files/xufilikumagidufejeri.pdf
    • http://batterseataxi.com/survey/userfiles/files/sununawadefuvik.pdf
    • https://turkihale.com/userfiles/file/
    • https://tidurmalam.com/contents/files/zuxezavetokefe.pdf
    • http://www.astmalek.cz/obrazky/file/31329184323.pdf
    • https://tiguan-wiki.ru/file/fijubitoxum.pdf
    • http://nhungbaithuocnam.com/img-tvdl/files/68226388145.pdf
    • http://www.smartusb.info/images/library/File/widaribe.pdf
    • http://sns.hu/_user/file/34104535336.pdf
    • https://usgcambodia.com/userfiles/file/xidusakawi.pdf
    • https://www.vignolaweb.it/ckfinder/userfiles/files/88111867339.pdf
    • https://pacantioquia.org/aym_image/files/jerusanojetuni.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_off0000b380.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB380 16792 bytes
font_01_sfnt_off0000cb97.bin
9bc3a7797e8c9ec784cd0292a6363d8bd4039634111d96aa2a5a24d43f6c2672		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB97 10608 bytes
font_02_sfnt_off0000e3b8.bin
504f350e8516eb6bfcc466662e31b04e9d9a4aa7482d1b232cae47617a332dc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B8 18320 bytes

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