Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b935207e1393a20…

MALICIOUS

PDF

79.3 KB Created: 2021-03-16 08:12:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e1f64ce09e6763855f2057c4cfc81d77 SHA-1: 9132ba3e590f1acf750f49f2666177c02bce93ab SHA-256: 4b935207e1393a20450a7c2b4fb9998670f04ec3698a041ffde96f4b1fd45696
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 0.9967

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://dafemum.ru/123?utm_term=benny+hill+song PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422133/normal_601110e9581e3.pdfIn PDF document text
    • http://instapriz.website/best_afro_pop_beats33b15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496165/normal_5fd2d72b67984.pdfIn PDF document text
    • http://honbiz.pro/apex_legends_file_size_pcy4ve9.pdfIn PDF document text
    • http://xajozixav.iblogger.org/15992476656.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/zIihzhc/fopijuzan.pdfIn PDF document text
    • https://cdn.sqhk.co/xadeviro/ieggjgq/toy_cars_and_trucks_for_toddlers.pdfIn PDF document text
    • http://reliables.ru/jejawu3fbau.pdfIn PDF document text
    • http://helplnstagramoffice.com/89890649227wk17.pdfIn PDF document text
    • http://fruits-summer.fun/paradobomijigelozinagu5vhva.pdfIn PDF document text
    • http://iranomics.com/61030492563c88qu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529281/normal_603998d774479.pdfIn PDF document text
    • http://neojust.ru/joburuwakunimiwunetexn1he.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450731/normal_60121a47113a4.pdfIn PDF document text
    • http://megatorg.ru/76093961509jhj3p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373998/normal_5fec72c16dd7e.pdfIn PDF document text
    • http://pubgmobiie.com/libevozodumoriagcnk.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwegamuvev/vjcggje/83010793445.pdfIn PDF document text
    • http://hempmap.ru/28866765488gxcgj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://paxexij.rf.gd/adobe_photoshop_version_6._0_free.pdfIn PDF document text
    • http://gepaxeli.rf.gd/learning_bass_guitar_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/dipaxiravavik.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/lebug.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/rulakumuwunutosu.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/homeworx_hw-150pvr_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/guwalopegi.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_off0000f9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DB 4792 bytes
SHA-256: 735f594b8c3490fd3177536a3bc2e692c1988c5da4150ae01257f720cd28b5c5
font_01_sfnt_off00010a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3B 11148 bytes
SHA-256: 9ea80f533f67e0303d447a44caa99b8c6dd9d952807fc7c7a8c32fe436c1e3ec

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