Malicious PDF — malware analysis report

Static analysis result for SHA-256 252c434e1fd1e4bf…

MALICIOUS

PDF

84.4 KB Created: 2021-10-06 01:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6ec9974f5aa5fe9d53e20624b389c6a4 SHA-1: ad7519cec37aa80a56b55c0d63157bc9ca0df9c7 SHA-256: 252c434e1fd1e4bf97f2e81daf53adb7ac633dd2926f7bcce5fe611653383bf9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were extracted, the embedded URLs point to a network of potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.pibmg.com.br/ckfinder/userfiles/files/files/damozavexavisedam.pdf In PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159fd667f2e7---nofalarabotebemewozitubu.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/rapuzidanul.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210921/files/20210921004526.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/18643757437.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/34936631799.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/23436571928.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149e9a2d9a8e---gozura.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/24099839235.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/39549232423.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210913_031529.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/11550075466.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/22207573225.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/wakasaviwisepapagalodore.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/pugagitov.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/retalemitepom.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/zonusuv.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/42840726669.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/96490407600.pdfIn PDF document text
    • http://maulich.vn/attachment/files/zarekijokaxevo.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/75090504159.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/6589511325.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/62271813527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=on+christ+this+solid+rock+i+standPDF link annotation
    • https://easyown.ddproperty.com/datas/files/kegamavusumilat.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_off0000dd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD48 10452 bytes
SHA-256: 376782b6a39e451c60b248274128c7de1f3f3254fee9425017f75c58a773c8b1
font_01_sfnt_off0000f4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EC 20812 bytes
SHA-256: 79dd06b4bb1dc59c52e875d10e7270bfbb3129bc6d8c2a87fc457c9724b16640
font_02_sfnt_off00012b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1