Malicious PDF — malware analysis report

Static analysis result for SHA-256 b351792ac694c166…

MALICIOUS

PDF

72.2 KB Created: 2021-03-28 07:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 016890ceed5412bad8d1ab6a8a2fd9bf SHA-1: 7c8222c212b54346713d5fbb8d58c3d091ed6923 SHA-256: b351792ac694c166c95b2e765a55649faa0d725f609da4524d316867aa2f4d0f
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 0.6871

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • 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/award?keyword=exercicios+analise+combinatoria+pdf+enem PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392656/normal_601cdb5b07cae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_60224fdbb03f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382414/normal_603410f41bcf8.pdfIn PDF document text
    • https://jowujutaxafekul.weebly.com/uploads/1/3/5/3/135348014/1e3d67db62df64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470385/normal_5ff322ff330dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489042/normal_5ff11a07031e3.pdfIn PDF document text
    • http://fasufigige.iblogger.org/how_fast_does_apple_cider_vinegar_whiten_teeth.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421218/normal_5fff76c61b21f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415331/normal_602e052ca100e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477408/normal_5ffba03fefdfd.pdfIn PDF document text
    • https://gejeximiba.weebly.com/uploads/1/3/4/8/134897602/wejadutemuwol_visotosuwux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490736/normal_5feb87c68b5b5.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/032212c3-1d74-4f76-8a38-3ac59de53e7a/27803403056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6393b679-4666-4946-a174-f6ec2f005feb/sears_12_belt_drive_band_saw-sander_manual.pdfIn PDF document text
    • http://fiwimawa.rf.gd/golden_state_warriors_injury_report_update.pdfIn PDF document text
    • http://nenunosulijud.rf.gd/8058876960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c14d2c3-c537-43b6-9e7e-0165a8947724/how_to_make_a_powerpoint_for_an_interview.pdfIn PDF document text
    • http://tipaduvorul.epizy.com/2174809125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/339b1c49-c07c-43b0-b154-3ab249177dde/kutekomufariwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e79a081-fc72-4f64-8959-055ef759c55e/74991866218.pdfIn PDF document text
    • http://temitiz.epizy.com/bonding_worksheet_electronegativity_and_bond_type.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f04370e1-4b83-443b-aed5-dbc716f0ab44/how_do_i_reset_my_apple_airport_express_a1392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aac49bea-91e0-4ead-861f-616ce06699f5/vaperuvebomibujamera.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF615 5464 bytes
SHA-256: b8d5e277776afc12906e83567e5458961631fba57e55d1f3a95ed9d18781370f

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