Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fa6274093338f2…

MALICIOUS

PDF

81.2 KB Created: 2021-10-13 11:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 049bf97174fa09fcde6efbec93a286d6 SHA-1: ee4a01705ab44163d5f78dfe4df4e02e9e22a143 SHA-256: d5fa6274093338f2f5b172451a5b9d9a0664ee32a37dfa9f57afdf1881a0c803
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the PDF is used to redirect users to potentially malicious sites, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=food+baby+belly+gif PDF link annotation
    • https://photofetimages.com/torekipajukamu.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/xenevukokiposupukodar.pdfIn PDF document text
    • http://bronia.org/userfiles/file/tubapurerujaduj.pdfIn PDF document text
    • https://fasaac.org/temp/files/98705796511.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/80254901880.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/49655355929.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/16082205556.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/69493204075.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/xobekibamoteba.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/50536991946.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/nupetijixujakorofokerak.pdfIn PDF document text
    • https://hyper.vessty.com/_img/files/juxogazalipigakusat.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/63862772329.pdfIn PDF document text
    • http://autoskola-weiss.cz/userfiles/delonerawolefimexewe.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c900109e2---29182149593.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614be83ed1b73---89450548925.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/28039890378.pdfIn PDF document text
    • http://gencatakan.com/upload/file/32549605724.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/90594524464.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/58387160654.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/xivox.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/77266882452.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/71196577872.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/7331590640.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_off0000d4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BD 19672 bytes
SHA-256: 24cca603b339e60eeff259214cb252b4fa31f36410fca2fae8be97f10d00284e
font_01_sfnt_off000107bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BD 10288 bytes
SHA-256: 5f7b0dc02b4c0bee46a6e34d0e54edb5ed7129043c45392ef603d202cc53c890
font_02_sfnt_off00011eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1