Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cbef38b301827ff…

MALICIOUS

PDF

74.2 KB Created: 2021-06-07 16:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3cd1d94e47befabd64f36b09f79d659e SHA-1: 0a25b7993b86c0c7da54a498572c5ed5eea4b581 SHA-256: 1cbef38b301827ffc515026b364e3fdf0519f73690266651899790ea01e58a9a
126 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and is structured as a link farm. The document body, though heavily obfuscated, suggests a lure related to 'listening skills' to direct users to these external sites, likely for phishing or scam purposes. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://huntic.ru/pbw?utm_term=what+is+listening+skills+and+its+types PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4419225/normal_5fe155980b9ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380694/normal_60430336dae28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_6054add5250b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387050/normal_606ad896d64ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465707/normal_5ff9f8c924afc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487194/normal_5fd8b53d39908.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485801/normal_60b836d4bee5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420766/normal_600a52f1ccad9.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4446496/normal_60b339cf73659.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482230/normal_5fcc9cc75b9de.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zowonixepor.pbworks.com/f/bloons_tower_defense_5_free_download_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9609c9f9-db9a-4006-8b20-83089f46391b/xomifijesesu.pdfIn PDF document text
    • http://kigemulu.pbworks.com/w/file/fetch/144784035/pokemon_moon_galaxy_gba_rom.pdfIn PDF document text
    • http://vejivab.pbworks.com/f/what_is_form_ssa-1099-sm_1-2021.pdfIn PDF document text
    • http://palixazoke.pbworks.com/f/nekagavenaka.pdfIn PDF document text
    • http://vananizi.pbworks.com/w/file/fetch/144629853/army_pt_uniform_regulation_temperature_guide.pdfIn PDF document text
    • http://gutopevif.pbworks.com/w/file/fetch/144605136/giant_paper_flower_pattern.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aa191a9-b870-463e-8cb9-1409c492ab97/nujasobezazaribi.pdfIn PDF document text
    • http://negaboxa.pbworks.com/w/file/fetch/144629646/difference_between_formal_and_informal_assessment_in_psychology_class_12.pdfIn PDF document text
    • http://bokibagaror.pbworks.com/f/laxekeliwudodekikatolewuz.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_off0000e68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68F 5304 bytes
SHA-256: 7568caf9ca782b71fc6eb80a2a183317663b1080546e1749cc101effe4b0825d
font_01_sfnt_off0000f8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AE 10228 bytes
SHA-256: 798aa1948d5aa781cc33b216cb894f6d010167e7f89ee7b9722c7e03419cc6e5

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