Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b597a8024f41c2…

MALICIOUS

PDF

79.8 KB Created: 2021-03-03 06:50:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 86f97cf989a352759936f6b1f452c9ae SHA-1: ee44a5735bee1c461396907ae80e255da99831ba SHA-256: 28b597a8024f41c28cb2d17c0be7ad32ddc8c0d0adeb9d239f6a39adba3a84be
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'midufefew.ru', suggesting a phishing or malware distribution attempt. The PDF's structure and content, despite being heavily obfuscated, are indicative of a lure to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=how+to+identify+a+pre-64+winchester+model+94 PDF link annotation
    • https://zuveravovizopow.weebly.com/uploads/1/3/0/9/130969477/67ba25e0fef3.pdfIn PDF document text
    • http://filopibat.22web.org/best_android_emulators_for_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490918/normal_5fe5a25c8690e.pdfIn PDF document text
    • http://vekenuv.iblogger.org/6627052676.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450351/normal_5fff623868980.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475863/normal_5ffe8582f2be4.pdfIn PDF document text
    • https://rajepejejema.weebly.com/uploads/1/3/4/8/134860913/4522154.pdfIn PDF document text
    • https://funofumid.weebly.com/uploads/1/3/4/8/134886651/94ea23d70d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378170/normal_601ce52a8d5e1.pdfIn PDF document text
    • http://sanezukevuzav.iblogger.org/govufikipe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jajabidabewaw.rf.gd/23400226110.pdfIn PDF document text
    • http://danesanifulen.rf.gd/alif_episode_2.pdfIn PDF document text
    • http://warufadul.rf.gd/34482722027.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/96876867424.pdfIn PDF document text
    • http://bamoxopigodarok.epizy.com/28163466462.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/89541693506.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/51822676388.pdfIn PDF document text
    • http://sabixisadosafa.rf.gd/23122903879.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/chapter_10_dihybrid_cross_worksheet_practice_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/charity_commission_registration_application_form.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_off0000ef4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4A 5980 bytes
SHA-256: 3ff1a810a708a78dcacda8a2241cb27185c09527c2a4ab8783ff967f8f2434fc
font_01_sfnt_off0001039f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039F 14024 bytes
SHA-256: bac1d0740749468350508dfd59606caef0b1aea5bb7ed0e8601ddc804025951b

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