Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9cda7e3f1daa5d…

MALICIOUS

PDF

72.0 KB Created: 2021-09-26 04:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16561b13fcfe4331fed0602322c171fd SHA-1: 7c42497df658a4606eff1aaacb3e3e5c9430d308 SHA-256: bc9cda7e3f1daa5d44db97710da5efb534a845339e1af8b4345409ac98f79912
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, pointing to numerous external URLs, many of which are hosted on potentially disposable domains. This pattern is commonly used for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://rajasthanmetals.com/userfiles/file/28273799256.pdf
    • https://bankubezpieczen.pl/userfiles/file/fumaliselil.pdf
    • https://barrier.exma.cl/ckfinder/userfiles/files/boxugomorukiv.pdf
    • http://4rrecycle.com/files/file/49433719894.pdf
    • http://zsdbiopharm.com/upload/files/46394382290.pdf
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/jisije.pdf
    • http://nanouklid.cz/upload/file/23581920265.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161372abcd673f---kotaxojalekukupuzupam.pdf
    • http://malopolskiszlakwinny.pl/upload/File/nakivefiwewikadasal.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/42518021157.pdf
    • https://groupburuemas2.com/contents/files/40800313957.pdf
    • http://matras-devison.com/upload/file/pibevekirasekekad.pdf
    • https://laughteronlineuniversity.com/images/upload/files/4751486235.pdf
    • https://flims.atelierleuthold.ch/userfiles/files/josod.pdf
    • https://heart-calligraphy.com/uploads/files/202109241606427804.pdf
    • http://www.taxivanclass.com/uploads/ckfinder/files/78685548303.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/2a90be75edc710b05dc3404f5a104e39/wejopajimagaginolul.pdf
    • https://newtech-utm.pl/userfiles/file/kojodoxufitowu.pdf
    • https://cplastik.com/data/cms/file/55960075363.pdf
    • http://oreade-breche.fr/userfiles/file/33344627407.pdf
    • http://innovad-ltd.com/userfiles/file/pepadaduzi.pdf
    • http://laiyi-art.com/userfiles/file/18267900903.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=free+robux+promo+code+generator
    • 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_off0000b492.bin
744f80eb9e477a0a37c2805888ec7395b375854e7eace79d3fab163c6ee033f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB492 17612 bytes
font_01_sfnt_off0000e1b2.bin
73513b147255a2d7b5532c3131290cc1428af6ec8951240070df84ef16d21c69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B2 10868 bytes
font_02_sfnt_off0000fa61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA61 16792 bytes

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