Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a47a3c7fc5938e…

MALICIOUS

PDF

78.6 KB Created: 2021-10-07 00:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c85f808f651b5b93b25d061d5b1d8a31 SHA-1: 0d49eead05e7086acca7589c8e2cb7d430f65bb4 SHA-256: 05a47a3c7fc5938ed4924fa0d59ec3441e092abc3ed38ca84585e29a25904a6f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to lure users to malicious sites. Although no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://philabc.ru/uplcv?utm_term=drag+and+drop+functionality+in+angular PDF link annotation
    • https://keluargamimpi.com/contents/files/41766665397.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159b09e5904c---ravevigebijidak.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/gabuzatemezusa.pdfIn PDF document text
    • http://belean.pl/userfiles/file/95264797184.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/pomiwiv.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/69196748439.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/josato.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/kibupeziwoxoxi.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/93269839408.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/26168432886.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/kefaxurusuvuride.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/donogi.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/botepoxu.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/razudibejokinoluwe.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/tomava.pdfIn PDF document text
    • https://noclegsosnowiec.pl/eurostyl/photos/file/60508846361.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/gisimadejuwotinolisupo.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/fuxod.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/lomevigizolejofirinujo.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/sixaxa.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/77176470175.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/zavivesizison.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/pawonopi.pdfIn PDF document text
    • 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_off0000c989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC989 10708 bytes
SHA-256: 248445a08c01f7f04147043b65981a75970d036bb427b81f5d928790fa6a7092
font_01_sfnt_off0000e200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE200 19512 bytes
SHA-256: b4596bfd7d8cb175b2693f7d54f8f8f863cac98600a07c3d114cef441fbbadb0
font_02_sfnt_off000114a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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