Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fda543f6b73e593…

MALICIOUS

PDF

74.3 KB Created: 2021-09-14 04:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 11adecbbc80a94c6e46dbb4a0ff571e7 SHA-1: f2bdc3bb8dcb575ecff1a8f6a4dae8309727992f SHA-256: 9fda543f6b73e5932fe82e45eb8ea5f11181c0d0aa88147f6d4d24c2f8134508
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document, possibly exploiting PDF vulnerabilities or using embedded JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://infrive.ru/uplcv?utm_term=how+to+enable+otg+in+redmi+note+9s PDF link annotation
    • http://fruhmann-elektrotechnik.at/fomususedamuvarodevikure.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/49955532114.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/fetaviwiriminafumoni.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/pizafemamobaguzoxavop.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/nawasepelit.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/bomolizurud.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/47618734174.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613035958ddc8---zidekepovo.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/80650919131.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__613FE43ADB470.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/85402921863.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/dubukevegixenulefik.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/11502557030.pdfIn PDF document text
    • http://coumert.com/images/file/dubamuvanag.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/19028524801.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1630951211126779284.pdfIn PDF document text
    • http://holzweiss.at/ratifiderozegixofa.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/74467541630.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/baromigutisiteresufujon.pdfIn PDF document text
    • https://dalba.net/other_files/File/lowepudotedudeg.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/fitibe.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_off0000bb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB65 17928 bytes
SHA-256: 64c070fad45aca03f01ba05db13b60d0ef028dbe90133783e32ecee0421a2c90
font_01_sfnt_off0000ea8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8F 10976 bytes
SHA-256: 78413d357f8ed66b02dc95ff147f3f1e3786b25983023c09b73d87975584d547
font_02_sfnt_off000103dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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