Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5404cace0b1a4b5…

MALICIOUS

PDF

74.5 KB Created: 2021-03-29 11:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 09792bc98447c48b6263600ebfdf6aba SHA-1: b89c4ef89e44f64611fa39c3550ce3bfad28ec63 SHA-256: b5404cace0b1a4b5ecae42a5b850d43c081115e3ad10cee171f02f0cfd401d08
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 pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish for information. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://soxebez.ru/award?keyword=english+test+a1+a2+pdf PDF link annotation
    • https://cdn.sqhk.co/luwagoma/ghjhhZg/dixavosalovigededagip.pdfIn PDF document text
    • https://lufojujerap.weebly.com/uploads/1/3/4/4/134481619/d803362f9734.pdfIn PDF document text
    • https://tanuroxej.weebly.com/uploads/1/3/4/1/134131309/705b70de6c1.pdfIn PDF document text
    • https://cdn.sqhk.co/xogixute/gie8hii/gartner_symposium_2018_agenda_at_a_glance.pdfIn PDF document text
    • https://cdn.sqhk.co/korebuxaguz/hg5hhib/clash_of_diamonds_match_3_jewel_games.pdfIn PDF document text
    • https://cdn.sqhk.co/gewewoturila/jc2L9gj/96632141815.pdfIn PDF document text
    • https://sidugavumudoriz.weebly.com/uploads/1/3/4/9/134902227/kegaxuvopigim.pdfIn PDF document text
    • https://cdn.sqhk.co/lukavago/phdmjiL/unikitty_save_the_kingdom_apk_download.pdfIn PDF document text
    • https://mesasijodise.weebly.com/uploads/1/3/5/3/135315214/7921989.pdfIn PDF document text
    • https://jimekijan.weebly.com/uploads/1/3/2/8/132815057/jukituvas.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/8VXutjZ/obstacles_meaning_in_tamil_and_example.pdfIn PDF document text
    • https://cdn.sqhk.co/tirinakiweda/exjgVie/sisters_thai_menu_fairfax_va.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/Pojajg6/16948601892.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36071b1a-d853-4ad1-bccf-0ed894d94038.filesusr.com/ugd/906e9f_27af9a1cebc64216bdc55329815e120f.pdf?index=trueIn PDF document text
    • https://5c3e38fa-bf2d-4cda-bfdc-19e9a39f2227.filesusr.com/ugd/b3ada4_5bee3aac8ea64553a6dece44a7b9050b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c62eaaf6-5e0f-413a-adcc-9e4356fb710f/dunkin_donuts_matcha_latte_carbs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72064a5c-b2cf-47aa-8286-2c7e2805d85d/55798521233.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8dffef5-fe1e-4230-9296-0f77fd4a8744/samsung_smart_tv_audio_out_to_amplifier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a3ec990-b2ce-406a-9747-7bfe925764aa/the_giver_chapter_16_book.pdfIn PDF document text
    • https://466f9527-ada3-48b4-ac0c-4ba5546996ca.filesusr.com/ugd/a4b6b9_f7502a424b404dfc9eb56e005a324eb1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b4a31d1-a530-48bd-9022-5f0888dc8958/99120822437.pdfIn PDF document text
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_8be760757b4a432ca95c8b96c2d21cd2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/46123126-1e0c-42e9-b9f8-2daa8ec864c8/air_force_1_white_high_top_mens.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf8e6875-ae42-4f42-9368-ce1ff57f537b/53338430861.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_off0000e401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE401 5348 bytes
SHA-256: 21c38add1cfeaeea66d710d61ecb17bb3c4ded4dcbe858f4da83454e4254fc04
font_01_sfnt_off0000f643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF643 11248 bytes
SHA-256: 61cf31de6826277ed4416ac05c70d10a8d087bc4c9a92ef6ba4c8e4b2d36faaf