Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a47a17e7a6bd747…

MALICIOUS

PDF

93.0 KB Created: 2021-11-11 22:27:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cd5ecc90909a7647f8ee196247d197f1 SHA-1: 758187eeb2778bd236a7aca838921ec8d0cf55f3 SHA-256: 8a47a17e7a6bd747fb4e44f97dcbcb8d2840f3de61b600ca798c06abd4e6b760
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or SEO poisoning attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating the document's purpose is to redirect users to a network of potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://mim2010.ru/userfiles/file/37322887529.pdf In PDF document text
    • https://soccerauquebec.com/userfiles/file/dofoled.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/ginaxixekosutawe.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/9444047061.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/76978367816.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/77859124366.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/65531425087.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/kujelodogoku.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/fogozuliruwo.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/fuduxuwitis.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/kofoda.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/90014009546.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/jugotagitebokabizeruluk.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/48089733424.pdfIn PDF document text
    • http://dztechfin.com/upload/file///zurubegaz.pdfIn PDF document text
    • http://xn--2-7sbddqrtdw3be6jua.xn--p1ai/userfiles/file/93832296416.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135a5f05ec30---pofirorasumegoj.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/62331923842.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/zezavibebi.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/16223564828.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/11291184824.pdfIn PDF document text
    • http://airzo.net/userData/board/file/bezifudofajidis.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/74119902196.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/zeloribe.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/Z3ufxtS7Wvw/uplcv?utm_term=victims+of+crime+assistance+tribunalPDF 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_off000105f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F3 18764 bytes
SHA-256: 441dff4aac95145a3c2b8348aace501ca79839b507bbf600287637371984cd22
font_01_sfnt_off0001366e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366E 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_02_sfnt_off00014d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D94 10704 bytes
SHA-256: d221a617d457ed46c0a85d42cbc7e1198150551056437a7a3f7f26e9d8c18a01