Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef52d63792429fb4…

MALICIOUS

PDF

81.1 KB Created: 2021-03-11 15:00:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 81447ecbbf7fae20b7d8f5c0ce5e2fe6 SHA-1: 604b88706933aa0dac39ef6fa7f494770debc4f3 SHA-256: ef52d63792429fb4b701c32f39ddd7aca91b19fd281ec233e930329a820ed791
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/award?keyword=aprender+a+dibujar+paso+a+paso+paisajes+pdf PDF link annotation
    • http://feedbacrnz.space/66738622668i7pc8.pdfIn PDF document text
    • https://cdn.sqhk.co/dipopoji/bjhl0je/drag_battle_racing_mod_money.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505820/normal_5feb812a3c7a1.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/nNdyijH/mibavoniwafu.pdfIn PDF document text
    • https://cdn.sqhk.co/setuboluraje/jhgx8ja/58352888111.pdfIn PDF document text
    • http://xagakojitogiva.getenjoyment.net/12672740419.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/ql2jrhb/kigokeker.pdfIn PDF document text
    • https://lutomired.weebly.com/uploads/1/3/5/3/135316507/1471265.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411512/normal_5fd8eba19af84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414689/normal_6018799ebadec.pdfIn PDF document text
    • http://sdek-24.cc/julowebusozorarirenfuxn1.pdfIn PDF document text
    • https://vamewifajezik.weebly.com/uploads/1/3/5/2/135297159/1716455.pdfIn PDF document text
    • http://small-italy.space/black_currant_ice_cream_flavour8kdtm.pdfIn PDF document text
    • https://nimaxosonoj.weebly.com/uploads/1/3/4/8/134897368/buwafagu_telesuda_wimes.pdfIn PDF document text
    • http://gordei2d.com/758794248350plrm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nimanexobubibub.onlinewebshop.net/how_to_use_the_oster_bread_maker.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/looper_2012_parents_guide.pdfIn PDF document text
    • http://rovizomaguwex.atwebpages.com/fupivipifipesenazum.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/usuraiya_tholaichaen_album_video_song_masstamilan.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/71699391553.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/ultrasound_guided_piriformis_injection.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/world_of_warcraft_engineering_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 5012 bytes
SHA-256: 27e1a0fc8f7e08e84523b952160b050ccc3a576923cf3e63f6e908d47a49c8cb
font_01_sfnt_off00010119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10119 11612 bytes
SHA-256: e57635fe8cf55835dddd21f68e3c5f33741ccb50d04f6cb61acea068d08f7a96
font_02_sfnt_off000126cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CF 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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