Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3880dea9be42391…

MALICIOUS

PDF

75.0 KB Created: 2021-05-05 15:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 285af29e8685b1b3c3b412a67b25e5ae SHA-1: 803cd2b44105041b256e36c8dce139e463891de2 SHA-256: e3880dea9be423911a0510c29eb608089f97e07f042af2bb50dfb743e875a396
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/strik?utm_term=honda+hawk+gt+exhaust PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484641/normal_600ab308f3a54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409411/normal_6038e99b20877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476420/normal_60618c249ff74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423155/normal_5ffe108fb40b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446170/normal_5ffc6c3e6ddf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_60504677e61ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501027/normal_600f4b5b3491f.pdfIn PDF document text
    • http://nususolajegak.iblogger.org/esl_worksheets_for_pre-_intermediate.pdfIn PDF document text
    • http://bapuvirovoko.22web.org/88075283885.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476275/normal_600917c822a09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414851/normal_6043f739a6854.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://toxuxefegetej.rf.gd/2908362403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfec3e34-e6ed-482f-819d-962715dab9d5/maths_riddles_with_answers_for_class_3.pdfIn PDF document text
    • http://wupepiwora.rf.gd/12572942989.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/usmle_first_aid_2019_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6092993e-9f1a-4168-84c0-af3c0ab45e09/reading_pie_chart_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/football_manager_2016_names_keep_changing_fix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b88fe10-f45b-40d8-a0f6-95c79472046c/56379015823.pdfIn PDF document text
    • http://buzuvemujogumob.epizy.com/thode_badmash_song_mr_jatt.pdfIn PDF document text
    • http://sasitegeke.epizy.com/82699848198.pdfIn PDF document text
    • http://pabixezo.rf.gd/fundamentacion_de_control_de_signos_vitales.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_off0000e537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE537 5144 bytes
SHA-256: 7caf3bcfd6cf54ad2cc291db5a60bc8b2397634022ad359759c49ef47743dde6
font_01_sfnt_off0000f6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 11464 bytes
SHA-256: d186a7a761155df0e8fcaefec86cf9abef5089115f99aedd73259968273c08f1

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