Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb866c6186c454d0…

MALICIOUS

PDF

77.2 KB Created: 2021-06-11 03:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 37b5fd4c7794eb4e52eee5307680e631 SHA-1: 3f2bb026977955dd493c9725a4464f58e839969e SHA-256: cb866c6186c454d008e0e72c5f45ab8ccf9d826f182e11e3ea1aeb0a7a5fccbe
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links, likely to distribute malware or phish for credentials. The primary malicious URL identified is https://allytemp.ru/pbw?utm_term=bike+racing+2018+mod+apk.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://allytemp.ru/pbw?utm_term=bike+racing+2018+mod+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415519/normal_6019dd784d55f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380680/normal_6041f435097ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366014/normal_5ff89547ca94d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389821/normal_60168d578b354.pdfIn PDF document text
    • https://vipagazowarofi.weebly.com/uploads/1/3/4/6/134685611/fekima.pdfIn PDF document text
    • https://xuxuratedagofat.weebly.com/uploads/1/3/4/6/134644764/01283ad21ee.pdfIn PDF document text
    • https://mirenixumevi.weebly.com/uploads/1/3/5/3/135309561/fubezisu-kadunosowej.pdfIn PDF document text
    • https://wapudonobisu.weebly.com/uploads/1/3/7/5/137512630/tukumekuf-dokiguzimi-bufov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://doxawadar.pbworks.com/f/hindi_movies_in_tamilrockers.net.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e9f0080-6ce1-496e-b40d-ecc240e986e1/79701632465.pdfIn PDF document text
    • http://zejokij.pbworks.com/f/happy_new_year_picture_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e11a792-cef1-400f-abf9-2d4576ef0403/ziduritoguke.pdfIn PDF document text
    • http://dadilotofexi.pbworks.com/f/pevapiguveteninadagefidu.pdfIn PDF document text
    • http://kemususi.pbworks.com/f/disney_plus_login_code.pdfIn PDF document text
    • http://wiliser.pbworks.com/w/file/fetch/144557079/jigaze.pdfIn PDF document text
    • http://bezawagiga.pbworks.com/f/48729889484.pdfIn PDF document text
    • http://zegugas.pbworks.com/w/file/fetch/145085589/wordscapes_cheat_level_5456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffcb2aeb-3581-4b25-a174-162673254fcf/16161799456.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/f/60803556248.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/w/file/fetch/144730071/haynes_manual_ford_fiesta_mk6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfafb788-473e-4347-956d-1ae072e43beb/edgar_allan_poe_the_raven_analysis_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc3c19f1-46bb-4717-96e5-19e655124e4e/freestyle_freedom_lite_owners_manual.pdfIn PDF document text
    • http://wozixokumo.pbworks.com/w/file/fetch/144713286/what_is_dstv_yanga_package.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_off0000ea16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA16 5816 bytes
SHA-256: 71b7a61bed6a2f167cd195796e0c5efe10f205cb8562c328b795ede906796ae9
font_01_sfnt_off0000fdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDA 11860 bytes
SHA-256: 5a8fa1b45ca01e3d5a11d732d80504bfc16f401e32f72f7f08021e5157fac925

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