Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e178900ce6f890…

MALICIOUS

PDF

68.0 KB Created: 2021-03-16 21:54:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 04083d67c96f76109f9b9949e1659926 SHA-1: c7bfbd03d090f2a15c3b0f1a8ee20680f741ba47 SHA-256: 45e178900ce6f890fe47f947584b35113ea70dcdb5c579bb80d3a5be7688da02
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on disposable domains, with one prominent URL being https://seumenha.ru/123?utm_term=castbox+apk+uptodown. The document body, though heavily obfuscated, contains references to 'Castbox apk uptodown' and authoring information suggesting it was generated by wkhtmltopdf, which can be abused to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=castbox+apk+uptodown PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453327/normal_5fccc363b28a5.pdfIn PDF document text
    • http://lonemap.medianewsonline.com/atlas_of_amputations_and_limb_deficiencies_3rd_edition.pdfIn PDF document text
    • http://bellissimo.online/wabuberokunosoparean7si.pdfIn PDF document text
    • http://canonsburglake.com/davunaluzobazamamuxegoxof1rax4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483610/normal_5ff66b1c15a20.pdfIn PDF document text
    • http://xofitazuregokud.mywebcommunity.org/17497759283.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/how_much_does_a_food_service_supervisor_make_in_ontario.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/094ac08b-88e8-4ef5-a53f-08573259b2f3/zopobuwa.pdfIn PDF document text
    • http://vibotiguxux.rf.gd/90093419425.pdfIn PDF document text
    • http://fabodatutowew.epizy.com/silipasiwujezasaveso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d225ff51-a881-4516-9625-aa3a64dca581/how_do_i_know_what_year_my_mtd_snowblower_is.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d12aa53f-5559-47ab-b125-c9ee14a81ed8/koguzewakozadapilepat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e072bf4-abb7-4113-9991-3564cbd7a3f8/93341957092.pdfIn PDF document text
    • http://suvalomimo.atwebpages.com/small_gods_audiobook_download.pdfIn PDF document text
    • http://piwakolipa.rf.gd/apostrophes_for_contraction_ks1_worksheet.pdfIn PDF document text
    • http://todidetiped.onlinewebshop.net/sandstone_diagenesis.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_off0000cdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBD 5092 bytes
SHA-256: 74fc7e791c22aa6578a093b001544691e15276d534ee0f9749415e58fcb9b91f
font_01_sfnt_off0000df2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2C 10600 bytes
SHA-256: 13639bf4552ae91f56033be0cd55e669f411d06d8b93558dcd5d0433429735a6

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