Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2086add689cdc7c…

MALICIOUS

PDF

73.6 KB Created: 2021-09-21 06:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e111f4f9fc42593c74a6f9a07f9edf0 SHA-1: 0c0caab2bdc5bbb6cd67e7d888cd04d0aa214f49 SHA-256: a2086add689cdc7c25c187e813355fdba7494b57599b72e239f98d63f0fe9d78
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Static analysis revealed it functions as a link farm, embedding numerous URLs that likely lead to further malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a deliberate attempt to host many links on disposable domains for deceptive purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=c+programming+problems+exercises+pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f80b8b962e---30883568756.pdf
    • https://asiarsolutions.com/userfiles/file/42670791861.pdf
    • https://betenrealestate.com/sites/default/files/file/47712837771.pdf
    • https://oriental-kitchens.com/userfiles/files/2401299952.pdf
    • https://www.scmsgroup.org/ckfinder/userfiles/files/55345850196.pdf
    • https://mariapolis.es/ckfinder/userfiles/files/74355614898.pdf
    • http://thestarbusan.com/FileData/ckfinder/files/20210917_7234880BFEAF7529.pdf
    • http://baovethanglongmb.com/upload/files/18457039159.pdf
    • https://doktor-ara.com/userfiles/files/14518540153.pdf
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/vifisexumaxumi.pdf
    • http://blccy.com/userfiles/files/51180086633.pdf
    • https://zhongzing.com/uploads/files/202109020513047386.pdf
    • http://exms.fr/sites/default/files/file/70760078037.pdf
    • http://arci-mp.fr/admin/File/sodotubufefomezena.pdf
    • http://sxhk365.com/uploads/file///kowakogizadojogakazaxife.pdf
    • http://affordableadobe.com/ckfinder/userfiles/files/50000498526.pdf
    • http://chamdure.com/DATA/files/27135381205.pdf
    • https://dukupahit.com/contents/files/45368125170.pdf
    • http://thecountryclub32055.com/userimages/19903236445.pdf
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/26253214059.pdf
    • https://ixiu-23.com/uploads/files/202109081204212161.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_off0000bc0a.bin
2369498365871e18cb014ef35476c66817a1c73fa3f995a1a44f54711bf56ee6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC0A 16600 bytes
font_01_sfnt_off0000e6e6.bin
78b3456eb84e47cbef6e86c4858fe1ff041da9b53839a5b717e27941f4ffe1c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E6 11136 bytes
font_02_sfnt_off00010076.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10076 16792 bytes

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