Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3329c6401badffd…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 12:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b5afcdd93ea995d6dfd3d3a4d8a85c81 SHA-1: fbb6c93ee057a4d9987b971259868d5c1c1a34f2 SHA-256: c3329c6401badffd98458514e20bbc2a82f452fad4cbb6a42f51897b831b00c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is unreadable, but the PDF structure and URL analysis point to a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ibextrail.com/editor-images/71122661457.pdf In PDF document text
    • http://www.anaja-inter.org/public/file/xobogosibakafejovote.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/74253451813.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/tawebixanelan.pdfIn PDF document text
    • http://patroha.hu/file/bexelemil.pdfIn PDF document text
    • http://kvrhousing.com/uploads/33825615082.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/sagumalo.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/vinudodujudefises.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/99740292523.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/dududizuxosozapasebewogi.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/wefisamuninonokuko.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/13805627821.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/15283341442.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021090704521738.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/xaxuzokamoma.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/sukute.pdfIn PDF document text
    • http://otczenacts.com/media/files/togowiriximizave.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/puporotifekexulor.pdfIn PDF document text
    • http://uchid.com/uploads/file/pisikuz.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/jadofilusapokalirib.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/26867143274.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/54954017170.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/fagumizilisuxegew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=download+photos+instagram+androidPDF 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_off0000b0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C8 10792 bytes
SHA-256: 63d664363e9f0286aab07166e427cf34c870a6152d41dcc7dd4c6b62af4f69b4
font_02_sfnt_off0000e13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13A 14992 bytes
SHA-256: 55330c3b0536c9c8243bc6b88848b0baeb3172e9815d7682e77cc55244f97a24

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