Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38cac06dd379324…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 14:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 21695bc12882af1d7de5c93be85cad6c SHA-1: 78fa45be3c8a79d75a296b4ca71746a414658d46 SHA-256: b38cac06dd379324b5ed8e3ff0038b1385c1623aeada85c2af57f4907cbf2770
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious and a phishing attempt. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=advantages+of+android+tablet PDF link annotation
    • http://avs-market.ru/admin/ckfinder/userfiles/files/sanubowowos.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/xobaziranorubitiw.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/40411287568.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/68703001597.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/89885720499.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/jepegakuwuxul.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/17292970949.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/24087034190.pdfIn PDF document text
    • https://asken.as/bilder/file/wusanovinidevofobuku.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/mujivomijuxejuputaxi.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/delatexovili.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/9774531553.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/zejokidexigumopav.pdfIn PDF document text
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/98521495580.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/senaxifezuremevo.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/gozowek.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/53619941035.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/14082654019.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/28989328266.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/pesobevawebixogazopaju.pdfIn PDF document text
    • http://egitara.com/upfiles/files/zowifata.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/wulefewiwogiwi.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/baxabaxixekepabed.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/bijafeloxiwosaxifilunowaj.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a0cbf438501a21e4e32665189f37aea8/sepanubotizozaruv.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_off0000dec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC6 17864 bytes
SHA-256: 8a6d66934823f65ec8147b2b37be0e1fd586ef0dcf00c9b8bbad3f4f91e8e231
font_01_sfnt_off00010c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3C 10716 bytes
SHA-256: 6f63f88c524b85f7aa5b09c826b45bbfd799fa1168667a023d1316100ce0bd35
font_02_sfnt_off000124cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.