Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e2787ae047604c…

MALICIOUS

PDF

75.6 KB Created: 2021-06-09 23:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9a0538ddcbcb9e52158c689593660887 SHA-1: 50bc39ece1cd907746ad085431de6f033f466a3a SHA-256: 73e2787ae047604ca9d9674c1afefe229c578dd502aed9f315e2e5867c44ed07
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File Execution: User Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://catamma.ru/pbw?utm_term=dns_probe_finished_nxdomain+on+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417818/normal_605daa6f537fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379046/normal_601bb8330edef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454170/normal_605f66c79730e.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4380694/normal_60b1b40fd7c38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469850/normal_60bff4f041fc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500453/normal_60515bfbe5c7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451363/normal_5fca4c50a8d1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409246/normal_60592ac18dad2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/aca032dc-9105-4aba-8880-505fb78c2dfb/bofamatakatolubeku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31a6314d-06e5-4150-9592-2e94e940d778/dobefus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cd7872e-5b7a-4805-a0ba-4b440bcd94f9/sajidexaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55c8cebf-dee7-4853-909f-eec1f666714f/xewewojoro.pdfIn PDF document text
    • http://dijakezepo.pbworks.com/f/50970301640.pdfIn PDF document text
    • http://noxixap.pbworks.com/w/file/fetch/144425994/descargar_cambridge_advanced_learners_dictionary_3rd_edition_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ce3b114-7bb7-4d86-87cd-28a28be28efd/kiwico_tinker_crate_instructions.pdfIn PDF document text
    • http://buvavipoluvu.pbworks.com/w/file/fetch/144424077/guia_super_mario_bros_nintendo_ds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6836ded6-c340-4aa4-9265-bb6c18e7db75/fios_tv_remote_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ceb211a-ce51-4497-bb56-10139d563dd8/tumososi.pdfIn PDF document text
    • http://redelaw.pbworks.com/w/file/fetch/144631821/jepudawapanojel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8deb52a-922e-4f77-85e1-f8ff2ee71461/guzavadanof.pdfIn PDF document text
    • http://fixunomavow.pbworks.com/f/6936613032.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_off0000e615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE615 5484 bytes
SHA-256: 11c36ba414d8d826c44bd33bb23e0af1dac295193e589bae7f183616a3c519f9
font_01_sfnt_off0000f89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89B 12016 bytes
SHA-256: 7550ee8de18e79db50a9bb626d915e8f6dfbb6040c25467f37289f738529a638

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