Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fca838dd2f8d767…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 07:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d0f081cff6c0aa61ce03203bd94bdb49 SHA-1: 11ca840f5b6de69133ecd9a8d75e8af94b22f890 SHA-256: 6fca838dd2f8d7678baf2380c2255bc485dfe635a9f6a375c80bcf4acad27de5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and form a link farm, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the link farm behavior indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://baugeraeteverleih.de/benutzerdateien/jezonosogupurasetopabife.pdf In PDF document text
    • https://studiecarriere.it/uploads/file/jopegilumolagidurosixejew.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/76452264726.pdfIn PDF document text
    • https://iwistw.com/upload/files/27810465338.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/nasezuwezuzol.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/gimikizozururatutazudig.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/kobojagojunolefimotero.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/marawek.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/73208882967.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/kofozuxepapimepo.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3a17dd0369757a3c0a272a8428e9592c/jomekojiliguriv.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/30238997623.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/95030439118.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/62773154612.pdfIn PDF document text
    • https://motoralbini.it/files/file/xawofabopewemadaf.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/xavidazixume.pdfIn PDF document text
    • http://landtop.com/filespath/files/20210918051547.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/rosokesiwume.pdfIn PDF document text
    • http://evola.it/userfiles/files/76542674981.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/zapewelab.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/t1ggk3j3rq366f67rkg2al7pcf/73014008643.pdfIn PDF document text
    • http://ewtch.com/upload/files/lavumozenazikegufukoleba.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/vazetozomiromovetumal.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/vevigalorepipofisupumaref.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=histogram+chart+examplePDF 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_off0000d8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 18356 bytes
SHA-256: 151ea50f1d4853f4e88dc837494baa70fd5cc6a7b953ebd9debae6c9ac6f6f01
font_02_sfnt_off000120c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C9 10808 bytes
SHA-256: 59e99f00269195d94a35d9658d4b7a78d741d5ad0b9cb3b0e69bd2c68a4950bc

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