Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c0cdf9c3ef3196…

MALICIOUS

PDF

70.5 KB Created: 2021-09-19 17:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50873f48eefb18b5eb20169efc7a3cf6 SHA-1: ad460bb2c0ef86766704870fffed33148d5fd372 SHA-256: b0c0cdf9c3ef3196820d87b899f3c3498f35b99f027c4d94b1cab4af1adc6781
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one that appears to be a link farm designed to redirect users, suggesting a phishing or malware distribution lure. No scripts were extracted, but the presence of external links and the overall heuristic profile strongly suggest the PDF's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://garglob.ru/uplcv?utm_term=all+mod+apk+download+app
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kijarodo.pdf
    • http://wahluenfty.com/userfiles/27038892929.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/62b598e14c37b02314c6f96a380e5783/miriruwev.pdf
    • http://dastone.ru/userfiles/file/vuvudeneluliremalasuta.pdf
    • http://klusjesindex.nl/images/uploads/kojevazoxikamojagukigumam.pdf
    • http://ih-consultant.com/ckfinder/userfiles/files/444286557.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/p2n0000pbqoc4dqgmpr1hcqgp7/85646807512.pdf
    • http://talesma.com/E/file/kodenenaviwikipuva.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/kisamufamadogi.pdf
    • https://ist-lb1.istanajp.com/contents/files/99801904293.pdf
    • http://eastindiaspray.com/suvra/eastindia_spray/files/30776065256.pdf
    • http://fotografieindex.nl/images/uploads/80217373905.pdf
    • http://rsti.biz/files/fck/file/bogebozevovefuki.pdf
    • http://vdtonline.vn/static/uploads/editor/files/52468740856.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_off0000b2f9.bin
fc1aeb199fce942728d94dc61dc979eccb830a907f7676068a2203f59330c247		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F9 10124 bytes
font_01_sfnt_off0000c988.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC988 16792 bytes
font_02_sfnt_off0000e19a.bin
924a5e5c8c5d878ac1f36611b237756c1507e8d35c0f117b23458a4f8a91f62e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE19A 17240 bytes

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