Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88a50ad77929955…

MALICIOUS

PDF

82.9 KB Created: 2021-09-24 02:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb88f4adb185b00a38d41afe6fbbe1ce SHA-1: cb3f7b3356249bdec2f379febfa3f313f6694250 SHA-256: a88a50ad77929955c7ea7b8fe57a14034fc9ce0f7c522a819331301ceb265bb4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed as a link farm, pointing to numerous distinct hosts. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via the embedded URLs. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142b1b81ba8b---19143227052.pdf
    • https://safewatersolutions.in/ckfinder/userfiles/files/5909099546.pdf
    • http://makassitools.com/userfiles/file///potivujisipuwamonedube.pdf
    • https://museuminiaturesbesalu.com/files/31579631538.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/9bd78cc59f21af25719468c49ad42120/butowinadaxobe.pdf
    • http://babyindex.nl/images/uploads/88194225790.pdf
    • http://ermolino.mebel18.com/uploads/files/63587435238.pdf
    • https://tnmkor.com/FileData/ckfinder/files/20210918_53C922006B000164.pdf
    • http://hak-al.com/resimler/files/gawafesovemafobe.pdf
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/9998303612.pdf
    • https://www.gurgy.net/ckfinder/userfiles/files/wakemomofadamu.pdf
    • http://cuathepvangohaiduong.com/images/ckeditor/files/pomagewujetoruzupeki.pdf
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/14919199114.pdf
    • http://yurisolomko.com/userfiles/file/kanazagiwudozivop.pdf
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/devodituvenuxitezat.pdf
    • http://theartofdesign.nl/ckfinder/userfiles/files/20036802284.pdf
    • http://kfnmdg.com/upfolder/e/files/20210918023029.pdf
    • http://dailygameresult.com/editor/UserFiles2/files/mobazova.pdf
    • http://taigesw.com/upload/files/tadunagememar.pdf
    • http://norilskgu.ru/userfiles/file/rafifine.pdf
    • https://podimercrm.com/img/files/79473439463.pdf
    • https://ms02bet.net/contents/files/nonitoni.pdf
    • http://abwcoliseum.com/uploads/files/vekatovuwonota.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=illegal+soccer+streaming+sites
    • 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_off0000e014.bin
c83870953f66ed260ea3cd5a71bf78ff66411d14ee67dcbd381d52e99cd2dc40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE014 10524 bytes
font_01_sfnt_off0000f7fe.bin
7e2b8eea457d04895263adf1a18c9439d3148e4650b5609ae5a68ad51d5af189		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FE 17912 bytes
font_02_sfnt_off00012660.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12660 16792 bytes

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