Malicious PDF — malware analysis report

Static analysis result for SHA-256 febbf9da56254441…

MALICIOUS

PDF

79.9 KB Created: 2021-02-12 02:48:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 78be8cddacb63f86499ed1b74c26e1fe SHA-1: e6512e1623187f9930c28158fe10d82f53bd1e19 SHA-256: febbf9da562544410b3fd9f608eb8e943cd97c2c6dd91d861d3d33b2c82b9719
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/123?utm_term=mcculloch+mc1275+heavy-duty+cleaner PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488322/normal_5ff40e6ba17a0.pdfIn PDF document text
    • http://kalavar.xyz/mount_and_blade_bellum_imperii7s8h6.pdfIn PDF document text
    • https://cdn.sqhk.co/kelifevaz/3cehixE/regions_conquered_by_alexander_the_great_in_order.pdfIn PDF document text
    • http://gouliwer.online/analyse_pestel_grande_distributionz8uxh.pdfIn PDF document text
    • http://idealica-uficialeitalia.website/dovadonuzebujakama6t17i.pdfIn PDF document text
    • http://azules.ru/metformin_500_mg_for_pcos8ks2x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493888/normal_600bd2bb2fa4d.pdfIn PDF document text
    • http://secret-empire.ru/10899421951lo0ew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366676/normal_5fec4b4d17a6f.pdfIn PDF document text
    • http://instofficial.online/lemesumuzuduwetijuzmbwp.pdfIn PDF document text
    • http://50off.pro/the_ultimate_hangh2sw7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402262/normal_5ff104ac6d614.pdfIn PDF document text
    • http://tublitalia.fun/28153205183y8fqj.pdfIn PDF document text
    • http://trujillostacoshop.com/alto_saxophone_altissimo_chart50dwv.pdfIn PDF document text
    • http://hookup157.online/protein_determination_by_kjeldahl_methodsl40u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vaxomuterok.epizy.com/bhojpuri_video_movie_song.pdfIn PDF document text
    • http://wegakitiz.epizy.com/asset_er_roblox_rhcloud.pdfIn PDF document text
    • http://sonowodiguvab.epizy.com/can_i_video_from_linkedin.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_off0000f76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76A 5588 bytes
SHA-256: ae62795f55257e6b105795f9e7f4dab9c04cbf1b9a5aafc4d66502bd1a7c5eb0
font_01_sfnt_off00010a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6B 11192 bytes
SHA-256: d2178f6a6c3ad92f658fbb8de0837afdd80bfcec481f092d88c326d87469968e

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