Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd50fb943074469…

MALICIOUS

PDF

72.6 KB Created: 2021-03-01 18:34:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 94d8876493566e67efb1dc9526144581 SHA-1: 46ab2c23286b305c7a0c3ae404dabdd1b4024559 SHA-256: 7fd50fb94307446911bbdbbf5c20048b955fcd277130494257303bf9ec860ffd
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, contains keywords related to printer maintenance, suggesting a lure to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/award?keyword=how+to+reset+toner+in+brother+printer+dcp+l2541dw PDF link annotation
    • http://itdiscounts.pro/maplestory_m_guide_wiki9kff1.pdfIn PDF document text
    • http://bestsalestoday.xyz/81223024758wpu8w.pdfIn PDF document text
    • http://fruitik.space/79668607026oc32r.pdfIn PDF document text
    • http://matroskin.space/formation_gratuite_pour_devenir_auto_entrepreneury45c0.pdfIn PDF document text
    • http://vashmaster.info/58907306864iugq1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://damedosa.rf.gd/dibomomataxav.pdfIn PDF document text
    • http://romudiforexove.epizy.com/sonazax.pdfIn PDF document text
    • http://tefesapebeto.rf.gd/girlfriends_guide_to_divorce_will_actor_change.pdfIn PDF document text
    • http://rowodebifofida.rf.gd/5235218661.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/zonolurosozunusike.pdfIn PDF document text
    • http://wodedane.rf.gd/trabajos_de_persiles_y_sigismunda_resumen.pdfIn PDF document text
    • http://pigunefib.rf.gd/35968816284.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://scripts.sil.org/OFLIn 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_off0000ca90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA90 5540 bytes
SHA-256: 7ab81b7bf40efeccb8c0a13f70a1e9e9851afbf2be674a6871c649657a8b046d
font_01_sfnt_off0000dd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7D 10224 bytes
SHA-256: bae80c920e077f77b23b03e768080ec8eedf4cbfa4fd44376e704b98ad8e07a8
font_02_sfnt_off00010079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10079 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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