Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca1b93bcaa859ae…

MALICIOUS

PDF

77.6 KB Created: 2021-09-14 08:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 88e4633a89cb3bc29f33f50423f6b7ef SHA-1: fa65000192d4166dd4ee169743db5b89386ece2c SHA-256: eca1b93bcaa859aebb942cf7ad655b65bf5d4afa60a85630218a91f0d1c36ba8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs suggest a phishing or spam campaign aiming to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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 http://highspiritsmusic.com/ckfinder/userfiles/files/91059533456.pdf In PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/50381566235.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/66773212376.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/36064714840.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/mitelaj.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/zamizavurabob.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/24973219417.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/xumijekonogaguvijenu.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/76514064702.pdfIn PDF document text
    • https://marosme.ro/hirek/file/73349108152.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/69604825825.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/52333460492.pdfIn PDF document text
    • http://hidropro.hu/upload/bisuvomadewowi.pdfIn PDF document text
    • http://kunbot.com/upload/files/55689872300.pdfIn PDF document text
    • http://195exim.com/datas/files/belebesorugesejilelo.pdfIn PDF document text
    • http://www.xzass.org/ckfinder/userfiles/files/lizotezedetunepebiba.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/fegisom.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/82878138744.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/85662473838.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/25861277892.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210910191126.pdfIn PDF document text
    • https://tele-video.ru/upload/files/33943101553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=show+me+all+apps+on+my+phonePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE982 10504 bytes
SHA-256: cfe30835d3335966373dde9e935a447ddda4a0c7524b613bed1cb55c060bc077
font_02_sfnt_off00010147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10147 17800 bytes
SHA-256: 824930e100ae3d6eaac601dacb0d30ca5c24216fff06c1ad47ca3b28acc9b6be

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