Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a51b4b5f29d70b…

MALICIOUS

PDF

92.0 KB Created: 2021-04-10 02:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1e4704f4c613c71aeb13f992bea643d3 SHA-1: c05e0ab47d73710370d6c1cb77872230c2bcd2d4 SHA-256: c9a51b4b5f29d70b741badd751bfd6be92e7842ef11870dcfaef790b7b96cbed
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable domains and redirector infrastructure, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/strik?utm_term=english+as+a+second+language+classes+free In PDF document text
    • http://reduslim-italiaufficiale.site/dead_soul_tribe_someday1vt1m.pdfIn PDF document text
    • http://trydouche.xyz/hp_probook_6560b_launch_datexycbc.pdfIn PDF document text
    • https://dibovasejul.weebly.com/uploads/1/3/1/0/131070518/netekulazuvate.pdfIn PDF document text
    • http://wibomulop.iblogger.org/zikidenapozopexatijib.pdfIn PDF document text
    • http://lelatomeneguwo.22web.org/beautiful_liar_zara_cox.pdfIn PDF document text
    • http://detonic-deutschland.website/natinrjj7k.pdfIn PDF document text
    • http://kersita.space/tugisid0e9y1.pdfIn PDF document text
    • http://qupieasy.online/maseloziges0fnoq.pdfIn PDF document text
    • http://exampl1214.com/what_personality_type_is_percy_jackson5e8ek.pdfIn PDF document text
    • http://premial.su/fingerpicking_guitar_lessons_for_beginnersghumz.pdfIn PDF document text
    • https://likizosuzi.weebly.com/uploads/1/3/4/8/134886942/da3a24f51a.pdfIn PDF document text
    • http://foxeged.22web.org/wimisukosibumivusagagoba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/17468f2e-797d-4053-ac15-d38783263d1f/rosemarys_baby_movie_synopsis.pdfIn PDF document text
    • http://mogozuru.rf.gd/exterior_angles_of_irregular_polygons_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26740964-f53d-4623-b4c5-3198cd913999/why_wont_my_irrigation_shut_off.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ede788cb-c90e-4922-bd6b-dd88fa744c35/xenusumusufoderobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe4b9eeb-e9e6-4cd9-bb38-3523e688511f/who_plays_emilys_sister_in_a_simple_favor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9850357-fd8d-4ece-8650-8186c829bb91/how_to_lighten_up_a_bedroom_with_dark_furniture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6669449a-bbdb-4a4a-87a4-3bc2b680f4b1/12738174785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66fd74e7-42e4-4063-8b77-e686743aff0c/how_to_put_x_in_a_calculator_ti_30x_iis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/897f72e2-8ead-46c6-b010-d32f4becb059/99261884411.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_off000129dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DC 5240 bytes
SHA-256: 356b07278de3d77ce47004ed3f3736d58593403d6cbddc9aa0fef8ef4239e80c
font_01_sfnt_off00013bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAE 11320 bytes
SHA-256: 0efe8a44ac7102f39a007d8070f032d677feac93ad01b534fd7e4d3e7473ba5e