Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9cc8b9f54e1eabc…

MALICIOUS

PDF

74.9 KB Created: 2021-03-25 13:30:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9af720c29a45a8fcc2591845e08970e2 SHA-1: c64bc9a508893e0337e7e45d384c750eb23decae SHA-256: d9cc8b9f54e1eabcd8d019d2c463f8b1304763dc20a1f9f3c9b410ce3162f6bd
126 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the link farm heuristic indicate a deliberate attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/123?utm_term=extent+report+cucumber+plugin PDF link annotation
    • http://cashthe.ru/forever_guitar_chords_kari_jobebja10.pdfIn PDF document text
    • http://clientesdkb.com/sony_home_theatre_bdv_e3100_review7u5j7.pdfIn PDF document text
    • https://cdn.sqhk.co/gabogivoxavi/pTjctn2/wopiwovijasid.pdfIn PDF document text
    • http://closemaze.com/51075100393g6rgg.pdfIn PDF document text
    • https://cdn.sqhk.co/refevebux/fqZj1xk/gorilla_adventure_games.pdfIn PDF document text
    • https://cdn.sqhk.co/givikofuf/gjhgoVG/46530608322.pdfIn PDF document text
    • http://tokigarodam.22web.org/18690363183.pdfIn PDF document text
    • https://cdn.sqhk.co/jupufopil/jaghidn/dukadepezutikuzuguwipaveb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_48749cd170174833a513efd57aef13da.pdf?index=trueIn PDF document text
    • https://1639490a-f715-481e-9fb1-af38d332269b.filesusr.com/ugd/a59130_b1b0d927009649dcbe54cb4bab96d611.pdf?index=trueIn PDF document text
    • http://wazododasexixak.rf.gd/23097618860.pdfIn PDF document text
    • http://lulanikigog.epizy.com/soda_anywhere.pdfIn PDF document text
    • http://sijisizaf.rf.gd/gazuxaw.pdfIn PDF document text
    • http://kirerena.rf.gd/ldc_answer_key_2020.pdfIn PDF document text
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_3b3853187aa44b9a967b00acf6b11ac4.pdf?index=trueIn PDF document text
    • http://buguteloseserup.epizy.com/tekutuvofugof.pdfIn PDF document text
    • http://vulomalizekuvu.rf.gd/game_bus_car_game.pdfIn PDF document text
    • http://xupapuxonoxun.rf.gd/28879687707.pdfIn PDF document text
    • http://ratimoli.epizy.com/fofavigavunujutidewotuviw.pdfIn PDF document text
    • http://rikovinob.epizy.com/how_does_directv_work_in_apartment_buildings.pdfIn PDF document text
    • http://mibovemijo.rf.gd/balanced_scorecard_powerpoint_template.pdfIn PDF document text
    • http://piwosilavor.epizy.com/calculus_basic_formulas.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_off0000e76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76C 5032 bytes
SHA-256: ab688eb64e688d4974cf28b06101845a1aec9dd17fd9de9d059427bb55b34f39
font_01_sfnt_off0000f87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 10952 bytes
SHA-256: a36d86aadcfa94ac47edeac1d9f0c010a9017f9fa44e56bffb8d560e9a3dd82d

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