Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66416d21d1cd51a…

MALICIOUS

PDF

80.4 KB Created: 2021-09-21 05:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aa33b028b066b89892b877968e53978c SHA-1: 130bf5e08284bfc1985706252fd08af215e80d4e SHA-256: c66416d21d1cd51a597bc3af8b833d97d95032f70874bcf45b6b47e7a8474bac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or credential harvesting campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF's structure is designed to redirect users through multiple potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=arjun+reddy+telugu+movie+movierulz PDF link annotation
    • http://hart-metale.pl/gimnazjum/userfiles/file/rineromu.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/sopigebuviwifonedofar.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/bapotadedeximafela.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/97334442836.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/pigutaweto.pdfIn PDF document text
    • https://phunhai.net/upload/files/novepifexeguvigin.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/jisivuwanuvonumogosaf.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ff405b6d7.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/xiwivutisamuguw.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/rijawibiwumiregomaxubikex.pdfIn PDF document text
    • http://dogwarts.ru/sites/default/files/file/xexukolologokinoxarotep.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/waluxidukofeg.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/10904636062.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/molisiwijovisi.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/miwagakevufewesikoned.pdfIn PDF document text
    • http://eternaseguros.net/files/files/kukadesesarodijefasodan.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/wezirabevavelozezu.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/65203385030.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/85217369806.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/zolizotulikafavusubaribog.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/58519862788.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/19900671255.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/fakupalabo.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_off0000d483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9A 10712 bytes
SHA-256: ac3552da93e6214df307f6a7315aa8c74e3bf740083a7aadeed2c71a8052b32f
font_02_sfnt_off000104f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F5 18144 bytes
SHA-256: 1723d66878bba9ae5cdb372a1ff05b31de05e2d413945c67deefee492a562202

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