Malicious PDF — malware analysis report

Static analysis result for SHA-256 00f5ca21851ff5b3…

MALICIOUS

PDF

73.2 KB Created: 2021-02-20 17:37:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 43e68f39680d3e7bfa9eaa21ff549d4e SHA-1: 8181ee4c4e32767f5ce264307c8014fce4f32fc4 SHA-256: 00f5ca21851ff5b3de857e2849962739b8c4b4f421f5605ca878b00c3a56dd6a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=schwinn+stationary+bike+parts+canada PDF link annotation
    • http://baderakavakuf.22web.org/10th_english_book_back_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427498/normal_5ff572e30655b.pdfIn PDF document text
    • https://gajabalavira.weebly.com/uploads/1/3/5/3/135347595/simikibazofoku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455890/normal_602aae8fd60ac.pdfIn PDF document text
    • https://zorutamazu.weebly.com/uploads/1/3/4/0/134096431/1953496.pdfIn PDF document text
    • http://subumobo.22web.org/bexegizajavokafinusoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479254/normal_602fb49f589a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375207/normal_600cb8930cc49.pdfIn PDF document text
    • https://jorosovepi.weebly.com/uploads/1/3/4/7/134706332/wakuvabedire_salojemozoj.pdfIn PDF document text
    • https://xuxozuxar.weebly.com/uploads/1/3/5/3/135326767/20c3b022be67d.pdfIn PDF document text
    • https://kagebavewijove.weebly.com/uploads/1/3/0/7/130740568/dafulomow_galiz_xugavojidaxutew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403951/normal_602f792e4fed7.pdfIn PDF document text
    • https://moxidoneke.weebly.com/uploads/1/3/5/9/135993461/2202338.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lorovaxejavagu.rf.gd/penn_state_civil_engineering_rap_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/88538599696.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/zojisovesanato.pdfIn PDF document text
    • http://xojakejib.epizy.com/homework_tracker_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/the_beatles_get_back_album.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/free_video_intro_templates_adobe_premiere.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_off0000e0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B4 5628 bytes
SHA-256: c8cbcf2634d1667b28991c48733b5edf3332309fb98acde2982e96787ac879dc
font_01_sfnt_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 10512 bytes
SHA-256: 99bb902123f0b6150c642bf505fe8983b147ad70bf2d861f46846779c2098cfe

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