Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d796f4ce898229…

MALICIOUS

PDF

83.5 KB Created: 2021-09-22 15:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9ce86e3b4945b5dce388a6387dc0234 SHA-1: 2f895b866f1a60793731afc4eddc0c4bcd9f498c SHA-256: 86d796f4ce898229c7798b131ab9bc1e912dec4bd1654d97eb22dab8417cc58b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://hz-karavany.cz/ckfinder/userfiles/files/88125227445.pdf
    • https://behbehaniprojects.com/uploads/files/nomarovigakivegisu.pdf
    • https://latgalesamatnieki.lv/files/file/pojezunojoxulewamewenabo.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd44e52852---78439869233.pdf
    • http://joltiy.ru/uploads/files/jobelunavidale.pdf
    • http://driver-jazda.pl/upload/file/67517044703.pdf
    • https://artgallery.devctn.com/ckfinder/userfiles/files/garurij.pdf
    • https://fablab808.com/nbloom/fckuploads/file/23279346005.pdf
    • http://www.parinet.fi/tiedostot/files/78934750423.pdf
    • https://nbtele.com/en/cache/fck_files/file/vavafog.pdf
    • https://facades-et-traditions.com/actualites/file/41534973815.pdf
    • http://mariondhuique-mayer.com/data/file/88492173531.pdf
    • http://zjgyuanhong.com/v15/Upload/file/20219181210182256.pdf
    • http://tulga.ru/editor/files/92811067066.pdf
    • http://irpuyesh.com/cache/fck_files/file/35720256182.pdf
    • http://erbaytag.com/resimler/files/wilozagigibarusi.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614258eba834b---kowakeketuwisobixopamij.pdf
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210912234636.pdf
    • http://huichem.com/ckfinder/userfiles/files/61032943168.pdf
    • http://carszana.com/image/upload/File/4757539291.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/koneko.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=env+can+radar
    • 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_off0000e471.bin
77da3a522841194ada0a7945cba1ce6cb91ddf85d1a58c97fa005ae554585875		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE471 18088 bytes
font_01_sfnt_off0001137e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1137E 16792 bytes
font_02_sfnt_off00012b94.bin
446762d262b5b26fe405a216abc94d3664468f9938ceb503e50fe34bcaf2464d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B94 9756 bytes

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