Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d0fa609c602dedd…

MALICIOUS

PDF

80.4 KB Created: 2021-02-27 13:12:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 981e4543c85abe020401656f742cf47e SHA-1: 9a1665975da191643ceedd1b8973c47b0775c887 SHA-256: 7d0fa609c602deddd794481bde9c68d77ac42d049345fbfbc54bef82e6aad4ca
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically pointing to a suspicious domain 'botokaw.ru'. Heuristics indicate the PDF acts as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the embedded URLs to redirect users to malicious content.

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://botokaw.ru/123?utm_term=ways+to+describe+the+sunset+sky PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369793/normal_5fee9f555449b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471512/normal_601fa0d5cc3d7.pdfIn PDF document text
    • http://fupodiruza.66ghz.com/xiluboruzavakid.pdfIn PDF document text
    • https://cdn.sqhk.co/wiradimabid/gjnuthh/cowboy_candy_salsa_recipe.pdfIn PDF document text
    • http://pavawafupef.66ghz.com/hygiene_worksheets_for_high_school.pdfIn PDF document text
    • https://cdn.sqhk.co/mumaxifup/PWhfhcO/train_simulator_ps4.pdfIn PDF document text
    • https://woxexawunum.weebly.com/uploads/1/3/0/7/130776255/708dd29801cc4e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://laxuwesesanaw.rf.gd/movasezumewezonatawanajep.pdfIn PDF document text
    • http://nugafafekovad.epizy.com/31994709578.pdfIn PDF document text
    • http://vagelebab.rf.gd/new_assamese_comedy_video_song.pdfIn PDF document text
    • http://bozexobasunuz.rf.gd/check_my_starbucks_gift_card_balance.pdfIn PDF document text
    • http://wubexemetaxoru.epizy.com/backup_android_phone_data_to_laptop.pdfIn PDF document text
    • http://lebasadalo.epizy.com/wogumojisejawe.pdfIn PDF document text
    • http://deketinak.rf.gd/45769936792.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_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 5312 bytes
SHA-256: a27e0d4ca096eb02812ba08a035628ca707cd924a8c68a6658c012638da87d29
font_01_sfnt_off00010ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFD 10860 bytes
SHA-256: 968db9b1c5709985c26b92dad79fad580607ca62d002f80a70444a8bdc558039

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