Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8101c6c0e494b12…

MALICIOUS

PDF

72.7 KB Created: 2021-04-05 17:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f9a8dadcb684dccd6708efd54145e9fb SHA-1: 1cd2f382ff02a103a00288cd64d6e4e6495ae78d SHA-256: c8101c6c0e494b12042efc828aff7236b0342aa90fc3d3c3854cad0ab6e0fbc2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains text related to a search query, reinforcing the lure.

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://jumiwimov.ru/wix?keyword=unidad+2+leccion+1+answer+key+did+you+get+it PDF link annotation
    • http://wajoxur.22web.org/49630665271.pdfIn PDF document text
    • http://jubigale.scienceontheweb.net/76717761425.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369330/normal_5fcc1de4b9e14.pdfIn PDF document text
    • http://zokidinodajives.getenjoyment.net/american_english_file_3_student_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386828/normal_602b7331bffa9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366339/normal_5ff1f3d890259.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446643/normal_5ff8dbbaa5621.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450351/normal_5fdd2312b6900.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zoratamit.epizy.com/30_questions_to_make_strangers_fall_in_love.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52854dd3-66ac-4f0e-a2ec-9a009545d64a/zewitasuwemazijapinu.pdfIn PDF document text
    • http://zekubegem.epizy.com/who_iycf_guidelines_2010.pdfIn PDF document text
    • http://rorokepu.atwebpages.com/evcon_furnace_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82ea4479-2535-4529-bdfd-bc6d1bc52cad/pakuxuxexisipefofivewit.pdfIn PDF document text
    • http://kavonuloruzofeb.rf.gd/cartoon_farm_animals_vector_free.pdfIn PDF document text
    • http://zujejuxuj.rf.gd/convulsiones_tonicas.pdfIn PDF document text
    • http://dereworizezo.epizy.com/jurnal_kinetika_adsorpsi.pdfIn PDF document text
    • http://repofifimi.epizy.com/eclipse_oxygen_for_mac_high_sierra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/976b040a-43b6-44b9-a671-6c99ad57009f/wuxedisawukug.pdfIn PDF document text
    • http://dudolisimak.epizy.com/logo_persija_jakarta_dls_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d8a8186-836b-4373-8fde-d81f0abfbb8e/ziguzesipikamamusepax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d48fdb97-1799-435b-abbe-93bfa3dc0b5b/zanowugutabunodifet.pdfIn PDF document text
    • http://vegizutix.rf.gd/75491086096.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_off0000dda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA4 5540 bytes
SHA-256: 21361f4810aac7621146d40c872befec3db7e70cfa389dae17fec2a9ee8965ca
font_01_sfnt_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 11084 bytes
SHA-256: 643a2e202a0ad88ff2a49ebdda87f304fde50bade2cdab0a257a5fb663c14ab5

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