Malicious PDF — malware analysis report

Static analysis result for SHA-256 a783fbc0715a4647…

MALICIOUS

PDF

75.8 KB Created: 2021-02-16 09:57:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 57125ca9a1dccc2ccdb0b8ac66e5fcc8 SHA-1: 04750679be412e6669a00f23183a802dee63c62d SHA-256: a783fbc0715a4647e1e38be50d5b39125ecf17e591cb9195abba31a825e9acbb
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs pointing to disposable hosting services and potentially malicious domains, suggesting it's part of a link farm designed to redirect users. The document body, though heavily obfuscated, appears to contain keywords related to product searches, reinforcing the lure tactic.

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://jottigo.ru/wb?keyword=yamaha%20mg16%206fx%20mixer%20price PDF link annotation
    • https://cdn.sqhk.co/fekebazi/Jgibica/salusilejate.pdfIn PDF document text
    • https://vizijupazikek.weebly.com/uploads/1/3/2/8/132814338/78e9c231.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/cg55hgb/clumsy_ninja_cheats_2020.pdfIn PDF document text
    • https://zazobowelukoki.weebly.com/uploads/1/3/0/9/130969428/sepekifijima.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367914/normal_5fe9920ab594e.pdfIn PDF document text
    • http://pmaider.com/deep_purple_child_in_time_piano_sheetqtdex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407562/normal_5fdaa8a66727b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366646/normal_5fd0948fae8a1.pdfIn PDF document text
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/4375821.pdfIn PDF document text
    • https://jitaginedisa.weebly.com/uploads/1/3/4/3/134324559/b6e80d.pdfIn PDF document text
    • https://loribipusav.weebly.com/uploads/1/3/1/3/131379532/335922.pdfIn PDF document text
    • http://kukushka.space/44059575417jlnbi.pdfIn PDF document text
    • https://nosodelutota.weebly.com/uploads/1/3/1/8/131857544/4512133.pdfIn PDF document text
    • https://zakoponuzu.weebly.com/uploads/1/3/5/9/135992890/6815923.pdfIn PDF document text
    • https://wegefaraza.weebly.com/uploads/1/3/4/7/134703567/kumefozimipejojaxe.pdfIn PDF document text
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/vesedidarabisoli.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/telugu_letters_practice_sheets205i3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 5452 bytes
SHA-256: 0ea8689e4ca2f72afb6fab71281c0a9417b3478c82e92f6c44cc5011d426bd2e
font_01_sfnt_off0000fd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD89 10608 bytes
SHA-256: 9602ea8a12469732614c3b6facb225c6eb6ab23ca99989daf0c3101329ee296e

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