Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86a7446542721f9…

MALICIOUS

PDF

77.8 KB Created: 2021-04-26 19:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dee10a44ced75d3529ded410d1f49073 SHA-1: 1439ab94b6e746b59e6749456dded40858d443ff SHA-256: b86a7446542721f9694eb736871dba08b59d4a7294975a924c8bfcf4a6fa73b8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://mezovuduw.ru/strik?utm_term=alcatel+one+touch+pop+c5+hard+reset+%2526+unlock+pattern PDF link annotation
    • http://rijunoje.mygamesonline.org/dugifolaza.pdfIn PDF document text
    • http://vexezujuzas.scienceontheweb.net/arupu_song_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/runusamopit/Voghhcr/sorufa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454045/normal_5ff7640431675.pdfIn PDF document text
    • http://fobexugelego.getenjoyment.net/95366219351.pdfIn PDF document text
    • http://ninuxalezopo.getenjoyment.net/difference_between_branding_and_packaging.pdfIn PDF document text
    • http://netopodimamo.mywebcommunity.org/18215618455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414172/normal_60248f186f2af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410678/normal_5fce227d21535.pdfIn PDF document text
    • http://salimom.mygamesonline.org/lamuzunesa.pdfIn PDF document text
    • http://kupimaxi.sportsontheweb.net/vunikop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460680/normal_6033b17b3db88.pdfIn PDF document text
    • https://cdn.sqhk.co/wepiwuvume/Vpxjft4/other_names_for_stealth_bomber.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404990/normal_5fc97b9fd8224.pdfIn PDF document text
    • http://fufejezonodim.mywebcommunity.org/28435120505.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wiwosotu.myartsonline.com/11835157420.pdfIn PDF document text
    • http://vilatelisoto.onlinewebshop.net/96096258908.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_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 5272 bytes
SHA-256: d694a07953690f5b47b926264efce227b93f53dec729e4c22dbc7d962c0c9278
font_01_sfnt_off00010358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10358 11348 bytes
SHA-256: 216b9a3d5e656b6379c124d8ef3f0b725b46693b187cccd64122b48afcadd691

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