Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe561c4faa31f9b4…

MALICIOUS

PDF

82.7 KB Created: 2021-09-24 06:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d89823d363af16322f2a5bfe63c8a38b SHA-1: 4c732b412892ebfeac92136370e239b9d6880778 SHA-256: fe561c4faa31f9b4c1ddf0957033c73a3f2194992007036e8c61fe579390536b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various PDF files hosted on different domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of a disposable link farm heuristic further supports this, suggesting an attempt to manipulate search engine results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://webbyshoe.com/fckeditor/userfiles/file/fukekubepulewozazesokelu.pdf In PDF document text
    • http://93564497.com/userfiles/35148343297.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/87121827422.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/80582016148.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109050855434429.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/6492388412.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/jipusaxofezizikusijawuvad.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/78926996259.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/nirulimekusosuviwemerosut.pdfIn PDF document text
    • http://minipit.com/data/files/roferelamuloxe.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/biwadopuzotin.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/tavitesaxirabetef.pdfIn PDF document text
    • http://dejede.com/userfiles/file/tubuwotavusilugina.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/tujesikusikivodufirexafaw.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/fe80c5a79aab4c193b18432c4702c49c/411179321.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/87831755722.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/02697f91b1fd5a3f07b6ca9befc64fc6/80175810030.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/muwotemovajakikipox.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/zakigesuzuveludixozebisiw.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/wijonovujigadixoj.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/mojerimebevarewivizizo.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/544107958.pdfIn PDF document text
    • http://kids-ex.com/images/blog/file/40387621750.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021918326214139.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/gegedijoxowavam.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210917055627404059kygk8.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=samsung+s7+edge+fm+radio+apkPDF 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_off0000dfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAB 17560 bytes
SHA-256: 2d167d2ff0f80fe9137f79182ca586af51343256477d42080db7b86051a3bad6
font_01_sfnt_off00010cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB4 11016 bytes
SHA-256: bbc08badddabc4bf868f833b4ac82164452cd415fc204f90221b0c2a9e851025
font_02_sfnt_off0001261a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1