Malicious PDF — malware analysis report

Static analysis result for SHA-256 61cb98402cceffe6…

MALICIOUS

PDF

79.4 KB Created: 2021-03-16 08:52:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5c0df0e0804c9356c90bb6bcb0d19547 SHA-1: d988efbceba089d225263593df767067046c75f5 SHA-256: 61cb98402cceffe6102c0434cc4965932cf32378394a7524ce024e23176d18e1
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains embedded URIs pointing to external websites, such as 'https://kuzutuzo.ru/award?keyword=cafeteria+management+system+pdf', which are likely used to host phishing content or download further malicious payloads. The PDF also exhibits characteristics of a link farm on disposable hosting, further supporting its malicious nature.

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://kuzutuzo.ru/award?keyword=cafeteria+management+system+pdf PDF link annotation
    • http://golden-bridge.pro/how_to_read_chinese_poetry_workbooky7pjv.pdfIn PDF document text
    • https://nigusejokolutat.weebly.com/uploads/1/3/4/6/134688827/4095600.pdfIn PDF document text
    • http://jenirafona.22web.org/binder_label_template_free.pdfIn PDF document text
    • http://rubisteq.online/fizar4fzii.pdfIn PDF document text
    • https://wovukevaz.weebly.com/uploads/1/3/4/5/134523328/153364.pdfIn PDF document text
    • http://blankid.ru/fapikawogezy456d.pdfIn PDF document text
    • https://verefatodefi.weebly.com/uploads/1/3/4/7/134722939/setafoguwevuboxu.pdfIn PDF document text
    • http://pl50off.info/38644477955blo71.pdfIn PDF document text
    • http://kittyplay.online/93415375123yovjf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a5fd1a5-58cc-4c0f-81f1-cc3f3acfd0f5/understanding_business_and_personal_law_crossword_puzzle.pdfIn PDF document text
    • http://xesijapapun.rf.gd/construction_company_profile_format_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/rugupozafiv.pdfIn PDF document text
    • http://tisudaxutuz.epizy.com/27435066500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/964cb78b-aaff-4b06-8f00-f31d739776b4/davigolupumewebavejibesi.pdfIn PDF document text
    • http://nakobebujem.epizy.com/38098817565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8df48cbb-bed4-4e2e-8c21-e5f3bc878498/92225461553.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/jojubevavefowafasofalarun.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/how_to_get_sponsored_by_nike_football.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/is_twilight_midnight_sun_on_netflix.pdfIn PDF document text
    • http://xojozefobulujox.epizy.com/fiwidazezo.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/bridgewater_pure_alpha_performance_2016.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_off0000fc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC34 5336 bytes
SHA-256: 5869fb2062ada5f8ee4d0b6fe9bf379b92b4ca6181fe959ca7570a9ce4735f82
font_01_sfnt_off00010e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4E 9892 bytes
SHA-256: e3ec836e612b40ea63f86005f11b670f14855278ed11168f26794d025668112f

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