Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f0e412f413b9000…

MALICIOUS

PDF

69.0 KB Created: 2021-09-30 15:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c899b35ab7bb68ed60356d1ace8580ab SHA-1: 18bf6281471c1f2577fe0c011429c5ed70718ae1 SHA-256: 7f0e412f413b90001b5c55e5a72cd307a8e992879df8f60db441d2e9c3a77eca
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also functions as a link farm, directing users to numerous external URLs, one of which is associated with a potential phishing lure. The presence of JavaScript suggests an attempt to execute malicious code, likely to facilitate further compromise or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=how+to+change+keyboard+font+on+android
    • http://nattukoottam.com/userfiles/file/48460977906.pdf
    • https://fultoys.com/userfiles/32603680380.pdf
    • https://valeaflorilor.ro/img/uploads/file/87326087834.pdf
    • https://zhansq.cn/upload/file/bovozikoresowoka.pdf
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/salejorojusafibejafaju.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161532d16dfe6d---99656436573.pdf
    • http://hz-karavany.cz/ckfinder/userfiles/files/35703599394.pdf
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/041124317080.pdf
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62245095679.pdf
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/36926574689.pdf
    • http://screen.by/images/file/71746864659.pdf
    • http://eatoceanic.iorderfoods.com/uploads/files/sakixexefaxavelenenidibi.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/0faa980e064d4213868f6ec4ed80fc3e/43468875368.pdf
    • https://valve-toho.com/userfiles/file/woviro.pdf
    • http://xz-brand.com/ckfinder/userfiles/files/lezowowokugiba.pdf
    • http://wittymall.com/multimedia/userfiles/file/98899389042.pdf
    • http://speed-r.com/js/upload/files/belotukezuji.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/lufinafororevunarun.pdf
    • http://xingzhongjing.com/userfiles/file/20210920114446_597721206.pdf
    • https://economiadecomunion.com/ckfinder/userfiles/files/74522543473.pdf
    • http://divapharma.com/uploaded/file/nojapuregipiguxix.pdf
    • http://agriturismolataggiasca.eu/userfiles/files/nonizoziledejozu.pdf
    • http://jatechkj.pl/upload/fck/file/89369531666.pdf
    • http://bet-balance.com/userfiles/file/golipefozemagozaxusowun.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_off0000aff3.bin
72d9e1b614cff8257fe40d8bc42190e2946874000f7ca118af976c8a69260a25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF3 10964 bytes
font_01_sfnt_off0000c929.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC929 16792 bytes
font_02_sfnt_off0000e13b.bin
58f8b906fe17676d5f90c8b1a4b877aa5a1d9528bd0ab81b72f81df7c73f8bd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE13B 14836 bytes

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