Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4ea7fa29e2e811…

MALICIOUS

PDF

78.3 KB Created: 2021-06-08 10:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9a8be5ea4fa56aa061d0df0b3b19c404 SHA-1: 262b7aa14346e76866ff6b4ee4e67dee4e7e8815 SHA-256: eb4ea7fa29e2e8114cd2dd2c3853f4f7f55caf336946ea2dff9493f34eaa999f
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to 'ketchas.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, appears to be a lure related to business advantages, aiming to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ketchas.ru/pbw?utm_term=what+are+advantages+of+sole+proprietorship PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475563/normal_60544ad910a5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453734/normal_6035633b1656d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502248/normal_60091ddb7d185.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460982/normal_603257ab85add.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4392237/normal_60aff7c448ca1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446270/normal_5fd091688ae67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411709/normal_6058455573463.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/22c37873-dd0a-48c0-ae72-87f41cd08533/46388640208.pdfIn PDF document text
    • http://xuresasadox.pbworks.com/w/file/fetch/144747276/anatomia_quirurgica_cabeza_y_cuello.pdfIn PDF document text
    • http://siseraxoru.pbworks.com/w/file/fetch/144647541/53747620190.pdfIn PDF document text
    • http://zeranagaro.pbworks.com/f/antrenmanlarla_geometri_1_indir.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/w/file/fetch/144417786/nujupalixasakufubedam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45deeec4-cb8d-4710-9b3f-9e89113160c7/minecraft_space_rocket_mod_download.pdfIn PDF document text
    • http://gosirata.pbworks.com/w/file/fetch/144445605/ligejabivojudopebudobaf.pdfIn PDF document text
    • http://barumena.pbworks.com/f/medical_surgical_nursing_10th_edition_apa_citation.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/xufuzitotababuxigiw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE901 5164 bytes
SHA-256: 82a58155429ad35e35db41f34987e838df019a79062df660e3b65bb2059e26c1
font_01_sfnt_off0000fa9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9D 10292 bytes
SHA-256: b6227e97609fe22a3d86ff82dceeffddb2272598bf36762ff3315cd900318297
font_02_sfnt_off00011da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA1 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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