Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc2fc0df552f72a8…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 14:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c0377c54988aef761add4d07797cee33 SHA-1: eabc369a5e8b20fc1d8a8cf4532931c70b01e656 SHA-256: fc2fc0df552f72a836e1c5bf7678c65b36f70fd0dc658bdf74b6aa6bc6ae49af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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 https://medvor.ru/uplcv?utm_term=bird+song+identification+app+android PDF link annotation
    • https://netiko.fr/img/Data/file/gekikepi.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/41262422808.pdfIn PDF document text
    • http://yongqingtech.com/d/files/wedizumevewureji.pdfIn PDF document text
    • http://ls-machinery.com/uploadpic/files/202109080314384430.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/govufe.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/devozuxuf.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/poxewuji.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/rorilojuwafapu.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613046e03d299---xipumixof.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/suvur.pdfIn PDF document text
    • http://devveb.net/userfiles/file/defipafiwisapidefenufor.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/nabavabu.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/72928607103.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/82736408445.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/13510551759.pdfIn PDF document text
    • https://ienter.bg/files/56101204583.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/88320679135.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/44358389589.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/fakajo.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/xikex.pdfIn PDF document text
    • http://isvpro.com/custom/files/72397170517.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/82204077087.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327370ba9c9---39619266192.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/zinifuwanubofopu.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/zikevofakadan.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/94063153920.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_off0000debf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBF 18108 bytes
SHA-256: cca72c160b699fe18bbb33f446d8452cfbbfd9963e3f86a6f6b5f736249664e1
font_01_sfnt_off00010d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D04 10804 bytes
SHA-256: f3c8fb8cfc8726f90d251b5acafbafc25d208e49eeb14ae5f2599955658ac958
font_02_sfnt_off000125e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1