Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c32cf704aafe321…

MALICIOUS

PDF

78.9 KB Created: 2021-09-08 20:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b0c27d097eebd725d97fefaca8cf5e59 SHA-1: 528771516bc419393ef6ff848890d58ad43faaa3 SHA-256: 6c32cf704aafe3217107478c2cd372de0263bc80227179cc88539ac71db8e1e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics confirm the malicious nature of the file. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest an intent to redirect the user to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://nagymester.com/userfiles/file/88952355628.pdf In PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/mitixuwasevax.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/86913658374.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/61137029540.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210907_12FA91A492FB25A5.pdfIn PDF document text
    • https://paperland.bg/uploads/file/96092094962.pdfIn PDF document text
    • http://newmob.it/userfiles/files/jikan.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/bajojesipusetetaladex.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/bonazizoxabudatiwapilet.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f570f3c268---wigelaxijubiviket.pdfIn PDF document text
    • http://cosyromania.com/media/file/lofajolalu.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/fisasulowexumate.pdfIn PDF document text
    • https://promise-land.com/upload/file/gatuxugek.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/luvib.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109072118455951.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/pawulatupetajulifemekeses.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/82352766416.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/49255225657.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/82623098914.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/xomefegakididep.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/32220114290.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/wodivimulaga.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/69624267700.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/31962324122.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/fesifimeti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=peugeot+2008+owners+manual+downloadPDF 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_off0000cfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D8 11136 bytes
SHA-256: 8c497fd2ee295a74095b088b223a6cdb5a4caf9406d05f344c86f8111f7c3532
font_02_sfnt_off000101d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D1 17452 bytes
SHA-256: 21eb4edabe15ed29b0eb44a04e32a27594e4b19b44616d3495bc9faca3ffbc0d

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