Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9f633d6ae62432…

MALICIOUS

PDF

77.3 KB Created: 2021-09-18 05:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 26eaf3ade0e23b75d4988375c208dad3 SHA-1: 1934fa6732a5548375f359128cd37a49c7ba2520 SHA-256: 8b9f633d6ae62432a2bce5b6b7f4d8801104c70db639c3ef986a4a30ebdff7cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content indicate it's likely part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garglob.ru/uplcv?utm_term=negative+words+that+begin+with+b PDF link annotation
    • http://idealhca.com/admin/images/file/28662585701.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/36244152705.pdfIn PDF document text
    • http://domuran.pl/files/file/41277685522.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613634f03f80e---mozasibekolopejokakilelu.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/10775522736.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/10074359877.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/52084677692.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/10638436748.pdfIn PDF document text
    • https://betsin.org/userfiles/files/82739202529.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/2516379338.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/nuluvowigovuwutegu.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/kebagu.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/81530791249.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/29432170229.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/79848217929.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/vomowuzopiwafavakutod.pdfIn PDF document text
    • http://emeat.ru/var/files/dinidasisotufifasob.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161318de611033---rojefaxewivofavukupukajo.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/12593492932.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c48a9fba1---37950507788.pdfIn PDF document text
    • http://zuche0551.com/upload/file/65107222237.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/fuvok.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/6898238806.pdfIn PDF document text
    • 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_off0000cb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A2 10748 bytes
SHA-256: b9f48d2334acb949c3950dddaa058395de63b30bf00ccbf9b470e20f93fc08f3
font_02_sfnt_off0000fc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2A 16828 bytes
SHA-256: 2a714f43c16196dbaf4fa1a7c4be170112b14101efd144b3bf5900e54867b754

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