Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd2f5f710d5b582…

MALICIOUS

PDF

75.3 KB Created: 2021-10-06 23:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e5d52d32aff03d3585f97daee3fab4f SHA-1: dca216c65b2facada8dbd094e62e36276171789a SHA-256: edd2f5f710d5b5825b6dae403c7554ce10d06bbfc5b30e24898511396023ae1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://ozdoby-betonowe21.pl/Upload/file/86959189525.pdf In PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/3cb754cdadc44973ddc79317db49c576/jakutirabafudevoku.pdfIn PDF document text
    • http://oiacreation.be/userfiles/file/kifimisumipikijef.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/94064953265.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/24809106699.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/33195182954.pdfIn PDF document text
    • https://kaparatt.com/images/File/63230452767.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/sosuvor.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/pakivixonu.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/xowenexobarofevibutaxa.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/feloti.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/adef1bfa5a0da7ca5af4df2ea82d473c/87217801238.pdfIn PDF document text
    • http://citranco.com/users/files/89834501691.pdfIn PDF document text
    • https://harley.dataroom.tw/upload/files/gabamomogugepibelob.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/80692105341.pdfIn PDF document text
    • https://indreninepal.org/userfiles/file/31657997355.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/rimeduva.pdfIn PDF document text
    • http://ingore.cn/upload/files/rateramimapusogi.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/vafogevutebomosas.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/gidimiwegemipinogotubaj.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/23715548684.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/rizaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=phasmophobia+on+low+end+pcPDF 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_off0000bf6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6F 10808 bytes
SHA-256: a41fd0c19dc1b98530c3ae07feb83af58bbfb342d00ab10e5e9b762f8747039d
font_01_sfnt_off0000d7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E6 18584 bytes
SHA-256: 6902991303471eaf22e03d8c76e88ee8317af0de958461190dad2981fe5ae675
font_02_sfnt_off0001075a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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