Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c2025195213f36…

MALICIOUS

PDF

77.2 KB Created: 2021-09-23 14:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ccad93e9a2d1e41c8e7c6420b1354ac SHA-1: 41e83fc93e9c7c4e9c22494ec52b380fa9f21f64 SHA-256: c8c2025195213f363aa4c9dc2d2b760e9d4866661a7d6f2add92f4fc8afc6b65
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 PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous disposable hosting sites. The embedded URLs and the nature of the heuristics strongly suggest this PDF is used to facilitate phishing attacks or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://synerhu.ru/uplcv?utm_term=words+with+aqua+at+the+beginning PDF link annotation
    • http://kientrucphatloc.com/upload/files/56353759926.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/56554480333.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/jarulu.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/mexeg.pdfIn PDF document text
    • http://santehnika34.ru/images/file/soxufa.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/56399194751.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/35633757387.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/luseduwux.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/daxugelubamerolopopovo.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/gumutabebujomifedopewo.pdfIn PDF document text
    • https://pixel.bg/img/file/xoteponuk.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/21376077948.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/vamikabasubugurotesop.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/64050949643.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/dinovesirozejazufaze.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/27320456238.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210902071438.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/rapakoxumabawisotikofojit.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/nosiverumotadu.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/49614002860.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/nuvipe.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/gedosomuwekaguni.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/88831828611.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_off0000c69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69E 18400 bytes
SHA-256: df156f8d22b468784ee7edaa6e689009c7bb7325de655cb4feea13cca84b2e47
font_01_sfnt_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE7 10948 bytes
SHA-256: c48ff84f727f779e1d782e6f4a3a329ac6466c7995b8c3469f637815762ae050

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