Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea28d69100ece155…

MALICIOUS

PDF

121.1 KB Created: 2021-05-03 15:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c154a9f23512e300d860214ac4dbfce SHA-1: 7f86b1a63b59d65ec7f948d71cff342668b39fd1 SHA-256: ea28d69100ece155d05504ef72785d6d2a389dbcf7de79638d0d055b7f3b9e8c
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'cnn news today live youtube' and 'wkhtmltopdf', which appear to be lures to disguise the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/strik?utm_term=cnn+news+today+live+youtube
    • https://xixemoxutosiseg.weebly.com/uploads/1/3/4/4/134473276/gugozasagudala.pdf
    • https://cdn-cms.f-static.net/uploads/4401518/normal_603d8d43ae581.pdf
    • http://zomolejefej.mywebcommunity.org/piwumakiwikofimob.pdf
    • http://bumosid.getenjoyment.net/87056853260.pdf
    • https://cdn-cms.f-static.net/uploads/4495241/normal_601632e81bba9.pdf
    • https://cdn.sqhk.co/komagiju/eyDGj1r/corcraft_stock_market.pdf
    • https://vuderuxedus.weebly.com/uploads/1/3/4/6/134692959/nepoger_sawozisu_jifupurimum.pdf
    • http://runojiwum.getenjoyment.net/edgar_allan_poe_espaol.pdf
    • https://woxoxoba.weebly.com/uploads/1/3/4/8/134893248/gekedirarot.pdf
    • https://cdn-cms.f-static.net/uploads/4379377/normal_605ad83e6cafc.pdf
    • https://cdn-cms.f-static.net/uploads/4379854/normal_601f3eabcf478.pdf
    • https://cdn.sqhk.co/guzowozuk/geaghge/bike_race_stunt_3d_heavy_bike_racing_master.pdf
    • https://cdn-cms.f-static.net/uploads/4424689/normal_600a94e422109.pdf
    • https://ziregorex.weebly.com/uploads/1/3/5/3/135351653/a1e7136fc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xomepixo/difference_between_bacteria_and_viruses.pdf
    • http://rawegutidum.onlinewebshop.net/ielts_recent_actual_test_vol_1.pdf
    • http://pefimubis.myartsonline.com/medicalizao_em_psiquiatria.pdf
    • https://s3.amazonaws.com/fosagoba/sobewizajikipebuwi.pdf
    • https://0c43c058-97b3-435a-b041-a9f001bfa883.filesusr.com/ugd/791d74_e6c2ed06c6244a28a89f4bcc8a9b8a30.pdf?index=true
    • https://s3.amazonaws.com/dipafuxe/vewosegusikuton.pdf
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_75d950567a18444aaa83ab94953f1f61.pdf?index=true
    • https://s3.amazonaws.com/tedowafomaru/tomanupij.pdf
    • https://94db4134-5784-44c5-a63d-963e509970fa.filesusr.com/ugd/9c58c5_2818086d3c5f4826bd7e128f81e0f694.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000198c0.bin
5f6b0bc2b422d0a7691368d8f166bd03b8059f6422f5942afd67b72d8dd57d13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x198C0 5020 bytes
font_01_sfnt_off0001a9fc.bin
30927b1e2ad37cd403272f104f0150c7d0a5f440f4a95ea9834fa83752a5a191		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9FC 12760 bytes

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