Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1281439aaee24f…

MALICIOUS

PDF

82.0 KB Created: 2021-10-07 18:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7acb3ff4a491b6d85d24c68410a89f76 SHA-1: aadd4770de8f1446a49fe90b83806ca62439addc SHA-256: bc1281439aaee24f871ed2f5a8b151ecca7f33b613ab33b63812c1bb73f13891
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to lead users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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://cructi.ru/uplcv?utm_term=gospel+songs+with+riffs+and+runs PDF link annotation
    • http://www.yemany.com/yemfiles/files/jemipavibojapes.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/77868481812.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/xekenibekipakedomilu.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/tuxesakevekegum.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/tezuganojifoje.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/54136889742.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/9530197999.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/47797017676.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/zobisolurelaruberevuwenej.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/rumufoletubevovawozazepo.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/36189790303.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/idgrkabpit95mijc0k6q8f5lm7/61033134835.pdfIn PDF document text
    • http://landpas.pl/upload/file/bupibuwigilukorotorepis.pdfIn PDF document text
    • https://noddy.nu/images/file/jagemuxob.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/sunijugojaxofekofadexutem.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/lusarijupoxirosevupilabik.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/bawut.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/zevagonufar.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614c29fb31862---tasalos.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/niwafe.pdfIn PDF document text
    • http://santeh.md/img/files/poxamab.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_off0000d7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 18936 bytes
SHA-256: aad9134bc075edfc57546d94947d040ff45f8b60d10c58297942bef0ba993f5d
font_02_sfnt_off00012147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12147 11000 bytes
SHA-256: c5e4063037376c362f4d0458fa530d3c8901268260bddc6ef8e83f70e485bf3e

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