Malicious PDF — malware analysis report

Static analysis result for SHA-256 18099988dea97b38…

MALICIOUS

PDF

73.8 KB Created: 2021-02-24 02:42:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: aa7f33a0aba1751b6d95105ca59da9f5 SHA-1: 3f184e510a107be88b6bb74ad892731a06c3e429 SHA-256: 18099988dea97b3803ff3854e99aa32d430b3dea2d5af59432553fa56422681d
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting and employing SEO-related keywords, suggesting an attempt to drive traffic to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying it as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://bologen.ru/wix?keyword=maddie+diehl+husband PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482853/normal_5fc6a6c8e2f40.pdfIn PDF document text
    • http://lajibodomemebev.66ghz.com/bad_boy_hollywood_movie_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_6014c101ccfcd.pdfIn PDF document text
    • http://puzigodemabotod.iblogger.org/wulumovavumibeduponuzonu.pdfIn PDF document text
    • https://funogefoxareso.weebly.com/uploads/1/3/4/0/134041001/feratebopixipesitela.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416927/normal_5fed5c084176b.pdfIn PDF document text
    • http://keborejozupe.22web.org/aortic_valve_replacement_nice_guidelines.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494417/normal_5fe0d382b71fa.pdfIn PDF document text
    • http://pedaropira.22web.org/what_is_measurement_in_research_design.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412570/normal_6026243611f79.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://revulagolorer.epizy.com/15293818919.pdfIn PDF document text
    • http://lidufaz.epizy.com/chief_keef_mixtape.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/nc_drivers_license_office_kenansville_nc.pdfIn PDF document text
    • http://lamekukibudinos.epizy.com/calicivirus_felino_tratamiento.pdfIn PDF document text
    • http://zusapogadakafa.rf.gd/91383355672.pdfIn PDF document text
    • http://beninoduvewer.epizy.com/kendo_grid_editor_template_validation.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/punenejezeserafokilimutus.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/frostpunk_ark_guide.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CC 4964 bytes
SHA-256: 81e66ac4621a2664ca4b1f8f7c5854afd0d10d4214feb480a91dbf6a21c229e6
font_01_sfnt_off0000f3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 11376 bytes
SHA-256: 707d6b213365e36173eba2db521208ba24a84627cd2f8130b588ee4d79bc5e7d

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