Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a05ad9bcc75fde…

MALICIOUS

PDF

73.8 KB Created: 2021-10-01 02:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b3bd12d28d8890b75252aab16ddf320 SHA-1: 3d503247e3230b9bd746581b09e969de2dae00a8 SHA-256: d7a05ad9bcc75fde5b2853fe6016eccaca997eaf0d35ae45d8d25a882dad9876
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV and an ML classifier. It contains numerous external URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or scam attempt. The PDF structure and embedded URLs indicate it's designed to lure users to malicious websites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://catamma.ru/uplcv?utm_term=how+to+get+free+v+bucks+and+skins
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137efd7954dc---98093875236.pdf
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/52621732693.pdf
    • http://gardenofsound.com/userfiles/files/40689284674.pdf
    • https://vayamcs.com/content_files/files/sogojujovenovewajabab.pdf
    • https://schodyperfekt.pl/user_upload/file/35302161185.pdf
    • http://twtqedu.com/userData/ebizro_board/file/riluvomatugewadevun.pdf
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/zevogemajatiwakisipa.pdf
    • http://bachova-terapia.sk/images/file/xupadewezefugugu.pdf
    • http://globalbizkorea.com/userData/board/file/85285549870.pdf
    • http://mt-filtration.com/uploaded/file/139863437361359d5af3dfa.pdf
    • http://aesg2edcv.handylover.com/upload/files/nubejedokalawozuju.pdf
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/nedufuxanefemariv.pdf
    • http://inciboya.com/resimler/site/files/sujoputepaxonitutiseloni.pdf
    • http://residenceraffaellotorino.com/userfiles/files/navefegepolifuvigokuwi.pdf
    • http://frutapac.es/ckfinder/userfiles/files/60468252573.pdf
    • http://papaicountrylodge-longstay.com/user_img/files/80370866452.pdf
    • https://matraci.info/UserFiles/File/87886658927.pdf
    • http://changwontour.kr/FileData/ckfinder/files/20210925_209029A104637DDB.pdf
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/31499725385.pdf
    • https://zlataraburmevuckovic.com/files/42113123085.pdf
    • https://anitacalderon.com/ckfinder/userfiles/files/92317022134.pdf
    • http://cathugo-catamarans.de/res/wysiwyg/file/56697072656.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/25385718a1591ecffa9a83405804ac25/8753447308.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_off0000b820.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB820 16792 bytes
font_01_sfnt_off0000d032.bin
398077b630c1e7ad6c9f5a4d3134a24c4c66b016b42f93e188822ea4c28daadc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD032 18372 bytes
font_02_sfnt_off0000ff79.bin
f6569a08b82b673bfad50985e38277a0128bb2d3e4619b27ea1672f8f6ea42cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF79 11080 bytes

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