Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34a592b6f9f8054…

MALICIOUS

PDF

79.2 KB Created: 2021-03-25 13:58:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f4c5c93cbba2c9222c0fb2bed38ec0a7 SHA-1: 44c4ff5f9508aa4261fc010b135a56b0b879bda8 SHA-256: c34a592b6f9f805444e12d8552082f241212c761a55cf7d30c3605f08e959f58
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. ML and ClamAV classifiers strongly indicate maliciousness. The document body, though heavily obfuscated, appears to be a lure related to a 'rent room agreement form', intended to trick users into visiting the malicious URL.

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://midufefew.ru/award?keyword=rent+room+agreement+form+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382948/normal_6008d83e60491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_600e57f7da515.pdfIn PDF document text
    • http://nikecortez.net/visual_basic_for_applications_tutorial_word3d1xr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451542/normal_6025469113ffd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500877/normal_5ffacf34d45ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494146/normal_605be4809ff89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443341/normal_60067338523db.pdfIn PDF document text
    • http://hookup154.fun/spandana._ap._gov._in_application_form5ovo8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375083/normal_6038121988a02.pdfIn PDF document text
    • http://visionnew.xyz/joxiwadedusabagxsj5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375694/normal_601c5b787e0da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371240/normal_5fd7ec55b291a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479678/normal_601e2cf6c562b.pdfIn PDF document text
    • http://hookup754.fun/2003_saturn_vue_v612r7f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/33718734205.pdfIn PDF document text
    • http://zezexef.epizy.com/accounting_information_system_ppt_chapter_3.pdfIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_6d60fc9b5aed4f5dad82c14cca64ed9c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xopugup/construction_safety_meeting_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/free_worksheets_adding_with_regrouping.pdfIn PDF document text
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_39cf90fa5148496eac811753ebfb66d9.pdf?index=trueIn PDF document text
    • http://jaxejibowanub.rf.gd/bovufiduminetopuvuwi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B3 5156 bytes
SHA-256: 74c8eb3d56468fe1b9cd2f4cfb68889b5547fdae34faef674481a123a0fb59f6
font_01_sfnt_off0001082f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082F 11124 bytes
SHA-256: b7295ed7eb9917dced8df8d8cde6eab09d68068ec68f26e4112e2b2d82879bd2

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