Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d2fde4a5d1d2119…

MALICIOUS

PDF

67.5 KB Created: 2021-02-19 03:37:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 01ba21f5d5b99c455311225e3896724e SHA-1: 1f11e0e798545190c9d5fe4f5c07e6e24b2cf0c0 SHA-256: 8d2fde4a5d1d2119026b1c3d2ed8b8aea699204fd7de1092383d9a9c1085f386
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, many pointing to disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, appears to be a lure related to educational content, likely to trick users into clicking the malicious links.

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://jacksth.ru/wix?keyword=odysseyware+answers+algebra+1 PDF link annotation
    • https://wugedelujexot.weebly.com/uploads/1/3/1/4/131456191/bulebu.pdfIn PDF document text
    • http://yoptan.space/android_7._0_update_apky5fct.pdfIn PDF document text
    • http://trendmobile.ru/nifaregzjv9f.pdfIn PDF document text
    • http://vseti.life/64424818863spp1c.pdfIn PDF document text
    • http://startask.ru/rubber_foam_sheet_for_sofa69vys.pdfIn PDF document text
    • http://trendmobile.ru/toro_lx420_service_manualnc0ah.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385436/normal_5fdc11081607d.pdfIn PDF document text
    • http://raifaisentapp.online/redlands_primary_school_reading_ofsted_reportk48uw.pdfIn PDF document text
    • http://websecurer.tech/vusupalajaratidijuzubi0n3.pdfIn PDF document text
    • http://nojagemegoxeda.22web.org/23188986275.pdfIn PDF document text
    • http://magicwoolshop.com/zewodez6ubfx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417997/normal_5fc5b790e732d.pdfIn PDF document text
    • http://net-klientov.ru/laxenubci9u.pdfIn PDF document text
    • https://romevezijije.weebly.com/uploads/1/3/4/7/134756673/zoriropubalozipedunu.pdfIn PDF document text
    • https://doxiviju.weebly.com/uploads/1/3/2/3/132302912/difujex.pdfIn PDF document text
    • https://tutuludoj.weebly.com/uploads/1/3/0/8/130874598/ce6a01b2fd091c.pdfIn PDF document text
    • http://normab-id.com/loxutupz1ojz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://datidogebe.epizy.com/35469491103.pdfIn PDF document text
    • http://timodetunidup.epizy.com/7368773001.pdfIn PDF document text
    • http://sosefamip.epizy.com/rewuxeg.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_off0000cac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC7 5408 bytes
SHA-256: 337f24c8de41ad88ad4485343e836bc5d07f4aa27a1a570efec20312e5acad22
font_01_sfnt_off0000dd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4F 10412 bytes
SHA-256: 4e72e27a62464885a933b6b50ecea3cc1eb8807102091d332827a222a0e23842

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