Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee5f2c771b1ad476…

MALICIOUS

PDF

74.2 KB Created: 2021-10-02 09:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ccc73c225aa91ef8f725b68528617a8a SHA-1: fc6da33edae9bde882134d9dc31c382469da915f SHA-256: ee5f2c771b1ad47624e5783a91ee73331de73a0f96be9cdc59c76393bf4cf7c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous links to other PDF files hosted on various domains, many of which are unknown or potentially suspicious. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically indicates a non-clustered link farm on disposable hosting, suggesting a tactic to distribute malicious content or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://frutapacargentina.com/ckfinder/userfiles/files/tawetizoxogej.pdf
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sixam.pdf
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/58561037151.pdf
    • https://cheesykeju.com/contents/files/nunatobowomeparemonubilul.pdf
    • http://sql110.com/pic/misobogunadibokenimiziru.pdf
    • http://siltherm.com/ckfinder/userfiles/files/16397955522.pdf
    • https://dcmheavyequipment.com/admin/images/file/53648554950.pdf
    • http://doudou.tw/userfiles/files/81361487442.pdf
    • http://bangdientunhk.com/upload/files/xisepesifidurodijomuv.pdf
    • https://conexkarvan.com/cache/fck_files/file/10852342732.pdf
    • http://ombs.ru/uploads/files/52483487133.pdf
    • http://pekbdt.com/filespath/files/20210923233120.pdf
    • https://plasy.com/uploads/file/13213948444.pdf
    • http://wadsoda.com/UserFiles/File/92691042974.pdf
    • http://sochi-riba.ru/ckfinder/userfiles/files/58038559758.pdf
    • https://777mto.net/contents/files/65754638568.pdf
    • http://nutrizionisti.eu/public/thread/risorse/file/sagafulidexewasapan.pdf
    • https://soi.icami.mx/ckfinder/userfiles/files/gapegofaki.pdf
    • https://krusomying.com/data/file/82372855246.pdf
    • https://mygoaltv.org/ipp/images/uploads/files/59566925953.pdf
    • http://gdlejia.com/uploadfile/files/20210922_234307.pdf
    • http://goldmustang.com/files/files/tabeguxumet.pdf
    • http://winfielddeli.com/ckfinder/userfiles/files/wiziraxuf.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=feeling+meaning+in+bengali
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000ed9f.bin
6d08800b0736f2391037722e4c6772258e41b8ca8d20cac51f83e6a764eb07f7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xED9F 16668 bytes
font_00_sfnt_off0000ad82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD82 16792 bytes
font_01_sfnt_off0000c594.bin
6c2cbb155d8a634f3df5e6b795cbd5f06824897f5b7bf14540126a82cd73c030		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC594 15856 bytes
font_03_sfnt_off000104ee.bin
db3d9b738481feda6fe7cf6de1ca944d8eed02e3984901a53e34e9b7cda6d5af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104EE 10080 bytes

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