Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4d403fe88506be…

MALICIOUS

PDF

90.3 KB Created: 2021-09-17 22:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f49bcbb1c27aad0c67902705e14be1e SHA-1: f27191f07ed7110f0fb88a4b40e6cafe58c03a58 SHA-256: fe4d403fe88506be0c1e60a3e595a680172e81bdcc9dca79f03995124774409b
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, as suggested by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. This suggests the document's primary purpose is to direct users to a network of sites, potentially for SEO manipulation or to serve further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368c730d6ae---43273283210.pdf
    • http://htbestcomputer.com/media/ftp/file/jezamepagaxemadonokor.pdf
    • http://drsuthichai.com/userfiles/files/1859542373.pdf
    • http://asv-solnice.cz/_files/file/15921569411.pdf
    • http://onelove.cz/file/fosefukodileduvi.pdf
    • https://balticstroy.com/uploads/files/66235439311.pdf
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/bubakubokoloborisi.pdf
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/fulepi.pdf
    • http://internationalnetworksolutions.net/files/
    • https://cevhertemizlik.com/userfiles/files/jutotisune.pdf
    • http://adams-gold.ru/archive/image/file/wikoxadejegopemalagapadof.pdf
    • http://himalayakebab.com/shipinc/userfiles/files/18688734600.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/82afcf853c93d4c388bc66b69d8ebc9c/varisoko.pdf
    • http://enjoy.sk/editor_uploads/system/files/93915569669.pdf
    • http://barrospizzadb.com/uploads/files/lemexozuson.pdf
    • http://rileyillustration.com/images/agency/files/pobikagim.pdf
    • https://bjjewels.net/nbloom/fckuploads/file/doxomudojifosijule.pdf
    • https://romalasergroup.com/userfiles/files/9923809588.pdf
    • https://milliondollardesiclub.com/upload_files/featured/files/lusawuluredevasiz.pdf
    • https://autoradiator.mn/uploads/ckfinder/files/mekozaza.pdf
    • http://work4shop.cz/userfiles/file/xogubatot.pdf
    • http://insei.eu/userfiles/files/fovubinupuxa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=star+wars+imperial+march+piano+sheet+music+free+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e23b.bin
bdce57997615d971762ee5bc30327b78460700afed128b9023a0923a166daaa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE23B 17668 bytes
font_01_sfnt_off0000fca0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA0 16792 bytes
font_02_sfnt_off000114b2.bin
46f8ba5d0df0a79902c962cd50442633cbce19f03f5d3b535c819aa23d6f4645		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114B2 17096 bytes
font_03_sfnt_off00014129.bin
116116b18d5ead34c98d0bd9786133d38af72a00fb40a1b27aa6453205d66d42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14129 11148 bytes

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