Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5692a4aea013366…

MALICIOUS

PDF

77.6 KB Created: 2021-03-30 13:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cb0bac4f800bf3783287ea1ef6aa65a8 SHA-1: 85045254b474f90f73907866140547abc63384e9 SHA-256: c5692a4aea0133663cf5a3bcd73691113ac649ec6fa43ce715a9e0105843ea9b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/strik?utm_term=what+is+compare+and+contrast+examples PDF link annotation
    • http://nasty666.space/32477899562uek5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408596/normal_60231a989f0da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467912/normal_6042453dee839.pdfIn PDF document text
    • https://cdn.sqhk.co/xiruregexibe/iajchaH/34216078174.pdfIn PDF document text
    • http://return-0.com/controllable_canonical_form_in_matlablolmc.pdfIn PDF document text
    • http://voirly.xyz/after_effects_templates_free_transformer8j4dk.pdfIn PDF document text
    • http://saniwigudovo.scienceontheweb.net/active_and_passive_voice_present_exercises.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368997/normal_5fff7cea0778b.pdfIn PDF document text
    • https://cdn.sqhk.co/vexagajezesa/jgKMhg0/oneplus_launcher_pro_apk_free.pdfIn PDF document text
    • http://saniwofixapu.mygamesonline.org/avivamento_do_pais_de_gales.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487662/normal_60181353c4aab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408993/normal_60610c41aa06f.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/array_data_structure_in_c.pdfIn PDF document text
    • http://winoorama.fun/power_pressure_cooker_xl_recipes_beef_stewr8sfh.pdfIn PDF document text
    • http://bagomebefekixob.getenjoyment.net/descriptive_chemistry_of_representative_elements.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_4acab6e5389d40f8830831653645d8c0.pdf?index=trueIn PDF document text
    • http://jugugesazo.myartsonline.com/16026984467.pdfIn PDF document text
    • https://f0f855fd-29d2-4bf6-9fdd-af1de8d1f91d.filesusr.com/ugd/184831_4590007165004a878e1a6dd8d5c1963a.pdf?index=trueIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_3c01d368ded347c19e88c7bb291034f0.pdf?index=trueIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_c701193b4e3c41f08e5d222dd20b2923.pdf?index=trueIn PDF document text
    • http://widepidaba.atwebpages.com/midsummer_nights_dream_short_script.pdfIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_4e38b15d315a4e66a682779aa59639a8.pdf?index=trueIn 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_off0000efca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCA 5396 bytes
SHA-256: 3b48e40595e3cb6c9221f9f2d312a37b576391b9d7d6b37d99333a6a97adf602
font_01_sfnt_off00010202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 10940 bytes
SHA-256: 62f273e075f38ebad0fe28d81e5aef8f37cd853109e924b40d8eaf297416d02b

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