Malicious PDF — malware analysis report

Static analysis result for SHA-256 d92e108cf69b4bcc…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 04:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7e0d3d103f5e44c74b31f0be8ef5ec96 SHA-1: a01d6de572fd56d4663796d159fdf5785a4bd5eb SHA-256: d92e108cf69b4bccb7014a30da87789759b197bcc3c493156143e59b609db2ef
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 external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document is designed to redirect users to potentially harmful websites. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it's part of a phishing or malware distribution campaign.

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 https://nomylo.ru/uplcv?utm_term=reface+video+app+download PDF link annotation
    • http://jaqalsports.com/files/file/mozonar.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/14368947985.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/84255844865.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/wonaruzutaxutirovazum.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c05484be62---72390666393.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109010557531570.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/99909607129.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/99942281607.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c8daca4dfacef3795bfbadb02c0502d3/38691903865.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/jorowekifededilaj.pdfIn PDF document text
    • http://potlista.com/file/files/lelimamuveteselexafali.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/31438807486.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210912065410.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/94729249191.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/85298237893.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210901144837857.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/48773043000.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/xebeva.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/gekekikuvitezalufuse.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/15689172763.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/nowaxetan.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/22913280788.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/wosikos.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/96217379521.pdfIn PDF document text
    • https://fultoys.com/userfiles/majakanepobaloxalaw.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_off0000d8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F5 10444 bytes
SHA-256: a34c43df57dc673286e7b91985a0b8a878a227976ad8a92d92d0dc15ffd122e1
font_01_sfnt_off0000f0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 18064 bytes
SHA-256: 5b14fb47a0c19a093a589663655b76e2415245e97ad71608e4ab688074062d5c
font_02_sfnt_off00011f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1