Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2868735cd70860f…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 00:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d44d92500460532d1850632e5fb0cda SHA-1: 3485f2cb84ffa252c8acf875d29dedd73e6993ee SHA-256: a2868735cd70860f31ad67730c207064e81badbb171aa12bfbbd5cab9425d28f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded links, many pointing to potentially disposable domains, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate an attempt to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://delta-serwis.pl/pliki/fodiziniz.pdf
    • http://alarm.pl/userfiles/file/59720563409.pdf
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/67212524967.pdf
    • http://tpt.taipei/asset/uploads/files/80126171936.pdf
    • https://xanbiente.de/userfiles/file/tadebaguv.pdf
    • http://yjccnc.com/upload/files/sepotesupe.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161490bb42deec---2131520515.pdf
    • http://twapp.freshkon.com/upload/files/1616606543.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/japidin.pdf
    • https://asiantms.com/ckfinder/userfiles/files/dibumibowosazibeg.pdf
    • https://premium-house.uz/images/file/digapokuxamake.pdf
    • http://ztracenaexistence.cz/files/content/file/xotuxumomasomebufopep.pdf
    • http://mfcpavpos.ru/file/77496067299.pdf
    • https://nisahanpin.com/calisma2/files/uploads/73246233098.pdf
    • http://mueblesdepladur.es/1/userfiles/file/zevegijezanudesu.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354c103b173---99642234410.pdf
    • http://mclarenquartz.in/ci/userfiles/files/muboxixaguvel.pdf
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/gepasodafi.pdf
    • http://ipai-bg.eu/img/file/mowetazod.pdf
    • https://grandhotelushba.com/userfiles/file/walidononudafu.pdf
    • http://vibrobeton.by/pics/files/dubagadolizep.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/68849003979.pdf
    • http://pro-group.ru/userfiles/files/95072764257.pdf
    • http://www.sictombbi.fr/ckfinder/userfiles/files/54795105893.pdf
    • http://ankurgroups.com/userfiles/file/15719278850.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=gaana+plus+premium+mod+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b321.bin
7513e45a5cd0705eacf01897c5d81deb2d1d665c686e0e9fdbe9ba815f26445a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB321 10688 bytes
font_01_sfnt_off0000cb95.bin
822b0f0d5229d80380020dafca949a2ac643bed7f60d5933beb6642d43b57b39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB95 16384 bytes
font_02_sfnt_off0000f568.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 16792 bytes

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