Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8dd985f39f0472…

MALICIOUS

PDF

69.4 KB Created: 2020-12-21 17:55:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 13510c312f6238a2afadc2f404ef28a5 SHA-1: 106cf00b258cc3b47cddca5e72693cb9f820fc63 SHA-256: 5d8dd985f39f0472bc052f5f4508e6439bcece8a7947253fb8cac6997007264f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafftec.ru/strik?utm_term=roblox+promo+codes+for+robux+2020+november PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419424/normal_5f99b75274212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479905/normal_5fd11b465f3a4.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/dudipa_xujupatu_zovuwewadowav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379723/normal_5faea159be169.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376362/normal_5f8a87557cda2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389823/normal_5f9c2057d8574.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/79431efd-6c84-4727-b75c-baf240a9a4b6/wedowijufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0289a249-29f9-4011-a7b6-95a8d7d85fe8/33093473561.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdfe613f75b166439b5de3/1606286945993/akashic_records_of_bastard_magic_instructor_manga_volume_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f32d4cac-cdaa-4806-9cf8-5754b12e06d3/portuguese_verbs.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fde987dd61098631976af48/t/5fdf84c9892c8943b0c368e3/1608484041427/formacion_del_acetoacetato_de_etilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea2ca629-6341-4bff-8e28-aa9621c09ef1/xuvigutuzinofibo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5aa07ea4a794d5665c0d8/t/5fca34779309303fb83adf36/1607087223899/does_jiffy_lube_require_appointments.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_off0000cfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC3 5640 bytes
SHA-256: fa7acf90f05e01dc5db710879ab6057e7b7b8c0bf677fca43e43c29c232cc0e4
font_01_sfnt_off0000e2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 11032 bytes
SHA-256: 28aa28f17842e3276d30b204eee104555256427961743f9275256cf3665963a6

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