Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eada86cacb8325a…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 10:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e96a11449bc14e3ba36e3b89d86956b4 SHA-1: 035b72eb0352774223a3968e499d1d18a9676057 SHA-256: 8eada86cacb8325a50345af98b89d2dc7a026f107740b716061851e03189c7f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it functions as a link farm, directing users to numerous distinct domains. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffbe9dc994---zufomukazekivesa.pdf In PDF document text
    • https://granitabrasive.ro/editor_up/bofasem.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/63542133527.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/89865512637.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/49107570804.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/tixewuxumezomexarivo.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bc8bcff75---nukukasese.pdfIn PDF document text
    • http://net-work.cz/data/file/kuwukiwor.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/muniwef.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/nazurowesunel.pdfIn PDF document text
    • http://snkpost.com/fckedit_file/file///20210913_14_5_2.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210910_065327.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/84498192885.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/vafod.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/tubokexekebumogeze.pdfIn PDF document text
    • https://0900107678.com/upload/file/vanone.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/71176552633.pdfIn PDF document text
    • https://mots.alaxarxa.cat/cmsimple/images/file/mixegafuligokowen.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/55659847040.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/35847546881.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/46840342279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=snapchat+android+dark+modePDF 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_off0000d45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45E 18116 bytes
SHA-256: a11fe0b51336b88d5764b6fdfba1827e46b8d718272193c6b81dbe6bf49f74ed
font_01_sfnt_off00010356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10356 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6D 10732 bytes
SHA-256: 656f366ffb18a8135f383f5861fe16178c6337c8631600ee5b18de81f16c8ec2

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