Malicious PDF — malware analysis report

Static analysis result for SHA-256 6354357d6d6e8369…

MALICIOUS

PDF

76.5 KB Created: 2021-05-14 21:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 44541d910d3462b2028962da58929c6e SHA-1: 57dba61437df9bcdc672f572aaa6729507896562 SHA-256: 6354357d6d6e8369d52ce987b9bd8e17db7dc4a173d98c5cc8be4b0b4a1380c6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or phishing. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jacksth.ru/strik?utm_term=briggs+and+stratton+vanguard+16+hp+parts+diagram PDF link annotation
    • https://cdn.sqhk.co/pulovafafita/jaARiho/diamond_crush_mirrored_wall_clock.pdfIn PDF document text
    • http://salufogi.iblogger.org/71547200186.pdfIn PDF document text
    • http://hookup154.site/algebra_1_compound_inequalities_worksheet_answers0l05d.pdfIn PDF document text
    • https://cdn.sqhk.co/bumegukomuza/ghxyus1/manunularazaruxib.pdfIn PDF document text
    • http://hydrofthol.space/feelings_list_nvc0actk.pdfIn PDF document text
    • https://cdn.sqhk.co/gilubibawi/phfbqQm/free_download_car_driving_simulator_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408461/normal_5fe163af3e8fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495039/normal_604d45cc345b7.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/623832a7-e31f-4fb9-9ac4-d8607d8d8726/psychic_self_defense_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06e03f4f-b348-47b6-a78c-e52228a3772c/gre_math_prep_book_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26683c88-c7de-4798-9025-4264045625a8/63956936589.pdfIn PDF document text
    • http://vonolukover.epizy.com/durga_saptashati_in_kannada_free_download.pdfIn PDF document text
    • http://bibuzijuta.epizy.com/42066704281.pdfIn PDF document text
    • http://redapisepiwu.epizy.com/html_interview_questions_and_answers_for_freshers_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/377305a4-91d4-4408-ac3d-4754a124183e/kifivotuzud.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_off0000ec37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC37 5656 bytes
SHA-256: 7e97d5622c3171803247dc99b287261cca30427d252347439c6bb0f52d8345f4
font_01_sfnt_off0000ff59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF59 11064 bytes
SHA-256: 95f7cd4d5ef556f2dd9ae352070a34438e7b2ac55ece20f985db3ca0d1c72c0b

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