Malicious PDF — malware analysis report

Static analysis result for SHA-256 0549ecb96fca6d5c…

MALICIOUS

PDF

74.6 KB Created: 2021-03-10 20:45:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 159a486ae5117818607ab065e7e7680b SHA-1: b06d398bc2b08280824dc4c8eaf41e5fca0256b2 SHA-256: 0549ecb96fca6d5c115394cf47f269eeec78ece5bd14c65d0727e17b21383889
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for SEO poisoning or phishing. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common tactic for credential harvesting or malware delivery. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://fokemale.ru/strik?utm_term=asus+x205ta+windows+10+update PDF link annotation
    • https://cdn.sqhk.co/fuvazuginu/hiGgegg/bozufalatude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385880/normal_5fe864794c36b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382790/normal_5fed56f6e8962.pdfIn PDF document text
    • https://pasifoberili.weebly.com/uploads/1/3/4/8/134881239/selisotugu.pdfIn PDF document text
    • https://cdn.sqhk.co/navozaxezini/hjjVjcx/among_us_mod_menu_pc_steam.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/s7NjijJ/skillmill_technogym_youtube.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413242/normal_5fedf286b22bd.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/Euij7li/49338469292.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/jmXxibS/infection_prevention_and_control_program.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/ihehbTp/buttons_a_new_musical_film_dvd.pdfIn PDF document text
    • https://dadotetixaj.weebly.com/uploads/1/3/4/4/134404583/075cb1b2f.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/second_grade_2nd_grade_measurement_worksheets.pdfIn PDF document text
    • https://tajizaruf.weebly.com/uploads/1/3/0/8/130813694/96c008b9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374536/normal_603db56b18e2d.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/idvggSs/57464963477.pdfIn PDF document text
    • https://nanuvofekoredam.weebly.com/uploads/1/3/5/3/135385966/kiminomipejuza_kuvamixere_nosozuwaginivi.pdfIn PDF document text
    • https://kuzapulekoxiror.weebly.com/uploads/1/3/2/6/132681507/dubabewurop_napumijogobu_zowibipokowofe.pdfIn PDF document text
    • https://cdn.sqhk.co/nilofixogezu/h4ha57y/lakers_swingman_jersey_wish.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/Q5hihbn/pawexudasakovuzisorezudi.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/hf0Ggjg/lijusifixilizupefumejevap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_efaa618519a74b71af2602caf2cd2612.pdf?index=trueIn PDF document text
    • https://f6ea5e03-7e7c-4dce-82ee-fd5d223759ef.filesusr.com/ugd/d203ad_3b369bd3549f4e2098cfbbd27f720938.pdf?index=trueIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_c7eb84c960a6481d98e913b71811a06f.pdf?index=trueIn PDF document text
    • http://dojafeduzig.myartsonline.com/risexamujapiduxoximis.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_off0000e6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EF 5424 bytes
SHA-256: 2548209382158f48dcee00c545b6aff05ccd48eb71a89b4971f3bb0250e8b68a
font_01_sfnt_off0000f99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99C 10388 bytes
SHA-256: 843b379fad04b09fbf457d68f528052eb6c779a2f5b35bbfab540d9c2c689dc0