Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7963333626c3489…

MALICIOUS

PDF

110.2 KB Created: 2021-02-26 05:16:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: f0f2ca58767332cd1bc8dc2afe18ebf7 SHA-1: c28b097658c20412e5aa49ab885719e785b4c91a SHA-256: b7963333626c34896026270e057de5b96081a626a1e767da305d026cfaa9fc37
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with many pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://baarspo.ru/wix?keyword=pizza+man+song+lyrics PDF link annotation
    • http://jojalipubawil.22web.org/necrotic_sword_of_doom_guide.pdfIn PDF document text
    • https://pebarefilegiz.weebly.com/uploads/1/3/5/3/135325086/3588f35a822.pdfIn PDF document text
    • http://shoop-fl.ru/33519142171duikx.pdfIn PDF document text
    • http://xufededubumavif.scienceontheweb.net/94052807309.pdfIn PDF document text
    • https://lirebuzufosol.weebly.com/uploads/1/3/1/4/131453665/nugopodavinanudobori.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/mystery_brain_teaser_puzzles_nz.pdfIn PDF document text
    • https://cdn.sqhk.co/gilevetu/7xWnujb/extreme_car_driving_simulator_gioco_online.pdfIn PDF document text
    • http://zumedemuruva.22web.org/ccleaner_slim_piriform.pdfIn PDF document text
    • https://rinixupikexem.weebly.com/uploads/1/3/4/0/134096042/tapusibomesunu_xesoxuwuxax.pdfIn PDF document text
    • https://cdn.sqhk.co/xudevekelefe/B4Z0geX/59835221143.pdfIn PDF document text
    • https://cdn.sqhk.co/worupageke/vghUhge/91868318836.pdfIn PDF document text
    • https://cdn.sqhk.co/zewapoxi/RhgjgGA/scrap_clicker_2_online.pdfIn PDF document text
    • https://goxejebifebiv.weebly.com/uploads/1/3/2/6/132682819/jesoluja-zewidilagejer-wivobekonu-rufadaje.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/how_to_start_a_fiction_short_story.pdfIn PDF document text
    • https://kutumamam.weebly.com/uploads/1/3/4/8/134893394/a301e3309387.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pexevogawi.epizy.com/android_app_for_smart_tv_samsung.pdfIn PDF document text
    • http://muxajetolalet.epizy.com/limorugigatovasegetux.pdfIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/juluwobinikegafon.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_off000168da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168DA 5272 bytes
SHA-256: 66e835ddc8d6ea70188803a0d781c74381f456c44500cbf511489a446559b4c6
font_01_sfnt_off00017ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AC7 15848 bytes
SHA-256: c69afe1ae1d475aec660d70d6d4bbb47e6e487156d2ce09b753dddb79c5ee570

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