Malicious PDF — malware analysis report

Static analysis result for SHA-256 310478c2c1061689…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 10:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d3713884ef811b4895e4b6ec47bcf17a SHA-1: 67a94e343f0e05037cbe85b50862c85bdbd4b76d SHA-256: 310478c2c1061689a9c977e72ed2046bc6c5679655e040c9e264fd0cdbcc022a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs that point to various domains, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the conclusion that this PDF is part of a campaign to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://newsale.linyn.mobi/upload/ckeditor/pages/files/jumobamibufi.pdf In PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/pifamusowixerem.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/paxoduses.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/64665061721.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/36013759832.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/wazolunezulemuwi.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/wazix.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/diwole.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/labibusizabet.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/49301077636.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/28615802374.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/guwololane.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/db76f0ba058c3d01d310f0d29dc6c729/ginavexozuse.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/1038255951.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/14463596349.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/wuxaxakomajurajik.pdfIn PDF document text
    • https://riwg.in/userfiles/file/dabagujanagiwim.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/newapu.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/zeruvafufexonir.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/36496277072.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135bba0274f0---81511342100.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/62878229632.pdfIn PDF document text
    • http://tulga.ru/editor/files/96451503083.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///48045088262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=planet+sport+1+live+stream+freePDF 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_off0000dc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2E 10636 bytes
SHA-256: 4d853645161f9f446b01917b30788d63530cd69cd3277f903edae042e77a301a
font_01_sfnt_off0000f496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF496 17476 bytes
SHA-256: 1c41f466e40de7248d2fa1fe1b31110fd16f514a484de625ca51b65fd01ea33d
font_02_sfnt_off00012200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1