Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b616929e2b2443a…

MALICIOUS

PDF

83.5 KB Created: 2021-10-09 01:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 58c8fb5130e25d8b7851356ec5fbdb15 SHA-1: 7030991c2332f5dbee9d274face418fbec6197e4 SHA-256: 7b616929e2b2443a7725e1b18aa1ce44466e18ab04e839af8f3495ff39a0383b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm on disposable hosting, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://yesfabric.com/images/upload/File/rifatifuma.pdf In PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/zobomevivajuzovuni.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/36878415187.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/76833529660.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/muwodilamefaraxi.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/50764753138.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/33592309746.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/kagubivotumi.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/wividilinivisunek.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/jerugez.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/fuxewakutilaze.pdfIn PDF document text
    • http://congluc.com/upload/files/rabijuwe.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/13987927392.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/povopasiredaguliles.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/50063374293.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/bipejavuxezosawa.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/kenut.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/vumokefebadun.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/wutubafi.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/75839663230.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210929_07A2E4DAF07D8D49.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/fibadusak.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/54438870502.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/wisilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=roll+2+dice+probabilityPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000da71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA71 10656 bytes
SHA-256: 500a58de426513e34fcedfdc24804440dcc02afa850bb448be5f2ca0c8616623
font_01_sfnt_off0000f2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE4 20700 bytes
SHA-256: 26e68c7cd24429aa28bd5d21b6c0c6216a2b5aa2445517699a675512d07fe181

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