Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd42528e5622ead…

MALICIOUS

PDF

80.1 KB Created: 2021-09-19 11:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 587d077ca1fd94f01af8bb9c5592c873 SHA-1: 694c8754d38f175660e2d2e3b434533c782d060f SHA-256: 7dd42528e5622eadb9f231aa010ef6f3cd3487f35fa3953272388bb55a475961
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable hosting, suggests a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://htygroup.com/upload/files/90347346367.pdf In PDF document text
    • http://dulichtantai.com/files/uploaded/files/42690395500.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/sikufinafebojejelel.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/76126188147.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/zurur.pdfIn PDF document text
    • http://bienbao.org/uploads/files/29983786344.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/56543569072.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/sadasopojatajupovemufo.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/xapofonijapavanebo.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/zixuxukon.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161372b4807c77---sesizavesibomizavo.pdfIn PDF document text
    • https://gameclub.by/uploads/files/39398965923.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/38840463790.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/32961153348.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/wesofigasivufiwofojoda.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/78466496961.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/gofupoxomex.pdfIn PDF document text
    • https://krajkarka.cz/userfiles/file/mexelux.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/felawenejaludej.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/f07eee32bc699cc1a8943821a752f42e/1943621095.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109131331219894.pdfIn PDF document text
    • http://midospa.com/upload/files/bomuru.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/nimazadidukijozowof.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/81950131642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+perfect+match+full+movie+download+utorrentPDF 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_off0000d05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86F 17916 bytes
SHA-256: 1fa31b3edcfdb8bd6147713d0a4e5d0f8d179c018cad79b10c9eb1f223ed6a7a
font_02_sfnt_off0001177f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177F 10932 bytes
SHA-256: adb6541a432859b4cdc76ebf8854bd82764133723c8f7f2e6d384b426d6df8cc