Malicious PDF — malware analysis report

Static analysis result for SHA-256 a103616d9c109241…

MALICIOUS

PDF

88.6 KB Created: 2021-09-18 10:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f776c5b97f7a3afe957144fbce17ac7 SHA-1: 5d432e844b6eddd9a0caa4caca784e80f1417bd4 SHA-256: a103616d9c1092410015eb33797b77441d394cd51a5eea39cebf621ef3c06877
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, many of which are associated with link farms or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF_URI heuristic specifically highlights an external URI, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, reinforcing the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://allytemp.ru/uplcv?utm_term=largest+and+smallest+country PDF link annotation
    • https://sskundal.com/userfiles/file/fedonetixetege.pdfIn PDF document text
    • https://renewone.de/files/tuzatuvefuni.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/fagujaxegisomikotafifub.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/41200677492.pdfIn PDF document text
    • https://dacola.com/upload/files/30755714135.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec5d4879c6---12779880419.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/33452953163.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/33216768336.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/67027903882.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/lonaxe.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/48568619795.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/vuwove.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/vedavabozapogewodib.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/57760514847.pdfIn PDF document text
    • https://mar3ol.com/Files/files/jemuxaraxuwapinubug.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/60849407979.pdfIn PDF document text
    • https://ratodua.com/contents/files/49066844016.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/11416001089.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7d229e850---29700333203.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/dizubexegufi.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/89683779296.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/56698386202.pdfIn PDF document text
    • http://grupophi.es/uploads/files/tirerezubipiwunaketulof.pdfIn PDF document text
    • http://identik.hu/editor_up/93447103758.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/20775667684.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/talawino.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_off0000f4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD4 10792 bytes
SHA-256: 2d404d484ea4088f3eebe1f8a7de8578a302061f74f4329945ed047c0299087d
font_02_sfnt_off00012583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12583 18148 bytes
SHA-256: 5d9d7ed4fa6311cd6140ceba4abd29bea8df616a395af8c744616329785b99da