Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ecc67e1da463c0…

MALICIOUS

PDF

143.1 KB Created: 2021-03-14 08:36:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f27cfd8df469afd6f93c1bfdb285365d SHA-1: e23ab3bf70c31371865fc86b81614a459c0d69f6 SHA-256: e4ecc67e1da463c0742f482e624213d20f627e9a240f753f5cbe73cb44a08be8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and numerous URLs point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://botokaw.ru/123?utm_term=hadoop+definitive+guide+3rd+edition+pdf PDF link annotation
    • https://cdn.sqhk.co/kopilixa/TJ414ie/89822649047.pdfIn PDF document text
    • https://cdn.sqhk.co/tisorobew/hhajeaD/magizoologist_wizards_unite_guide.pdfIn PDF document text
    • http://virnet77.ru/daley_marsha_alone_together_lyrics0tbm6.pdfIn PDF document text
    • http://azakalaza5.xyz/how_do_you_know_if_its_viral_or_bacterial_pink_eye4k377.pdfIn PDF document text
    • http://simcars.ru/dujidasigqkr.pdfIn PDF document text
    • https://cdn.sqhk.co/gufadiviw/tgghcyM/game_menu_launcher_for_pc_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gapalagabig/eFdjhqu/numero_banco_bradesco_pra_transferencia.pdfIn PDF document text
    • http://microbladingeyebrowsdallastx.com/juvepoxgty4.pdfIn PDF document text
    • https://cdn.sqhk.co/supopareso/ojhjjgc/compact_weekender_bag_vera_bradley.pdfIn PDF document text
    • https://cdn.sqhk.co/bepesewutu/jhnghKt/25249273080.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://votarodajogagup.epizy.com/arduino_uno_software_download.pdfIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_fc131f5cf7f6442e9a030914a01d036c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bupijila/hcl_technologies_annual_report_2018-_19.pdfIn PDF document text
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_1388300c5e634851b1bbed711fcc6008.pdf?index=trueIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_91a35d7b40d543c08270f0d16c8f61b3.pdf?index=trueIn PDF document text
    • http://joxumokuri.epizy.com/iron_man_cake_template.pdfIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_6a1c8540f6fa4d16a07a48aae168ddac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/palevijuj/radare2_user_guide.pdfIn PDF document text
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_32c4f5afabc24d73aace18b765992f40.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/mcgraw_hill_math_5th_grade_answer_key.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_off0001ed6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED6D 5184 bytes
SHA-256: 782b83698b23891d1a3ac2ea36c48da433a28737ec39088491f22bc4ea611179
font_01_sfnt_off0001ff33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF33 13684 bytes
SHA-256: 47ecdfd34b3b69e502464022f4199804f076fa25352c28b55d42d247c831c23b

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