Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8cba94df35f40d…

MALICIOUS

PDF

75.9 KB Created: 2021-04-05 17:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2495ce5a407f4187a9d5cefa2d1792bf SHA-1: 045c7e4d451f7d0b5f4ebd8c503ab2e8b66df2b7 SHA-256: dd8cba94df35f40d6ca2b5d4f35af048520562e74dd0af3cd2d3d0c2445137e4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, suggests a lure related to document translation, directing users to external sites. The presence of many disposable hosting links further supports a malicious intent to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/strik?utm_term=how+to+translate+english+documents+to+spanish PDF link annotation
    • https://cdn.sqhk.co/raninogozo/biehojh/sevaxan.pdfIn PDF document text
    • https://cdn.sqhk.co/kerikone/evurhfN/google_chrome_software_for_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487432/normal_5ff51a19edf8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408463/normal_602ad67f52711.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/Aha6CYI/morazaza.pdfIn PDF document text
    • http://phulop.store/72853208668xxhow.pdfIn PDF document text
    • http://kipupera.22web.org/great_clips_application.pdfIn PDF document text
    • http://pixell.store/diversity_statement_for_job_application_samplebj6t8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373987/normal_600d9c1f49cdd.pdfIn PDF document text
    • http://1offpark.xyz/the_sociopath_next_door_downloadei07c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413867/normal_5fd5f0026cfd6.pdfIn PDF document text
    • http://kudezixajuxuni.66ghz.com/vivufemive.pdfIn PDF document text
    • http://pixelbarista.com/wezatelofomejerenebetosl9xom.pdfIn PDF document text
    • http://igoscandinavia.com/are_trig_identities_only_for_right_trianglesx1eia.pdfIn PDF document text
    • http://idealicaufficiale.website/nombres_de_selva_scouts_manada7pyyd.pdfIn PDF document text
    • http://vas-rem.ru/groth_lecture_notes_in_macroeconomics80wfs.pdfIn PDF document text
    • http://clebohets.xyz/71192819652f46fv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394060/normal_6046201583da2.pdfIn PDF document text
    • https://cdn.sqhk.co/milimewaj/7gcfQhj/weather_radar_tampa_tomorrow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://seweromovipuse.epizy.com/simple_present_tense_questions_exercises.pdfIn PDF document text
    • http://migisunutejelu.rf.gd/41756983906.pdfIn PDF document text
    • http://vajavilodufolix.epizy.com/50825174845.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_off0000e7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BA 5540 bytes
SHA-256: 41ad1936df31a55beb31eb9e1c4f3a487285ec847704755f5d160ea9c97e65e3
font_01_sfnt_off0000fa6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6E 12272 bytes
SHA-256: 3e29f0756145ba11d203a932bb7a8a964369efc3ea487cb32cbf8b5568be6b83

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