Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef49c274c8afea4…

MALICIOUS

PDF

74.1 KB Created: 2021-09-25 18:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 402353eb77069bb0b5ed754b2a71ac03 SHA-1: 33e02fa75ffd766f00293b4b3fe3a3fdd0d0b693 SHA-256: 6ef49c274c8afea46b5822e96bcc86367066e4d0d818311b135a2cf27752b463
66 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious. It contains numerous embedded links pointing to various domains, many of which appear to be disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, suggesting the document's purpose is to direct users to potentially malicious or spam content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 4

  • 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://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/7de08670528a0cb771c12100281bcf59/19351933945.pdf In PDF document text
    • http://geologicatoscana.eu/userfiles/files/83078426943.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/lisilivuxurejiwiweto.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/99478988831.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/meviwajep.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/nalitijofekutitokawef.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/tawumisoveruf.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/tuziwivorelul.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/lamafubepogojad.pdfIn PDF document text
    • http://nensi.si/upload/file/vudumubofonikebitej.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/50559194892.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161353f064db19---lomabidizugadet.pdfIn PDF document text
    • http://giga.sk/storage/file/8023304004.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/49937293050.pdfIn PDF document text
    • https://5uempat.com/contents/files/23644426759.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/49991465238.pdfIn PDF document text
    • http://beta-rc.com/upload/files/80499319843.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/jipul.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/leraletuvob.pdfIn PDF document text
    • https://viceda.com/userfiles/file/40856437874.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/7724426294.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/5047143937.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/sadunefojegilinodoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=marvel+realm+of+champion+apkPDF 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_off0000b8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BC 10628 bytes
SHA-256: f50b8bd2994b67d7be7287b29c21444f7e616946108545c979de28d1216058ff
font_01_sfnt_off0000d0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E6 19224 bytes
SHA-256: 54f9314d94cc5800cec77af302f28f52b0d8695ac7846499997ff73fe9760bac

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