Malicious PDF — malware analysis report

Static analysis result for SHA-256 475f7ee5295884b0…

MALICIOUS

PDF

88.8 KB Created: 2021-10-21 21:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3554295a874d936b66c37e89ddd64890 SHA-1: 8b14f20ddc7d94844af628d8c856d6a4b3c63154 SHA-256: 475f7ee5295884b0113f244a1b6be50161cd4d0535f0ee820ec27736eec34e18
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting an attempt to redirect users to malicious content. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, indicating a common tactic for distributing phishing or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://efeteknikyapi.com/userfiles/files/mugenexino.pdf In PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/fb2461c5930a168de0a82bf34a28027c/jigonidut.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/49910122209.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/77748433629.pdfIn PDF document text
    • http://seamacros.com/upload/file/39876646542.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/22427966319.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/62060173317.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/disujagixegobuxis.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/57197873951.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/47908022560.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/tufulixudafekujomoxedit.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/3189939666.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/84255185329.pdfIn PDF document text
    • http://kite-surf.sk/files/nirukiloradapovumaxu.pdfIn PDF document text
    • http://yztools.com/images/upload/File/davivum.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616f0d3c48829---38630936543.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/tuzikirutaxenidivibat.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/dezarovufajiz.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/5399445989.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/vosusupatidof.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/rojuwejemelawusupok.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/kinidatefaje.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/gagilupusovemedaruxovimi.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/26688219112.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/bimeputupafimixagilagixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/TSvcnjQ06Jg/uplcv?utm_term=periportal+lymphadenopathy+causesPDF 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_off0000f22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22A 10992 bytes
SHA-256: 45acea23662135db6c322454a7ea9c32a2e69e4c7b158a077de63ca159838a17
font_01_sfnt_off00010b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B86 18800 bytes
SHA-256: 179cce49e6352d84c60eee079b3b0a3b6aaef9b88cba3de8c5757e7ac806745c
font_02_sfnt_off00013d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1