Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a16d55e70d1831c…

MALICIOUS

PDF

69.0 KB Created: 2021-03-10 22:45:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 226fac2b9752f335e7a14e73f978c8ae SHA-1: 707af196ec363a14f235604a6fe9b63f6157f153 SHA-256: 4a16d55e70d1831c450d211fa606192628a130e897b279cb57832f677de4f2a0
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of 'utm_term' parameters in some URLs indicates tracking or redirection, further supporting a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://maypoin.ru/strik?utm_term=grimgar+of+fantasy+and+ash+light+novel+volume+1+pdf PDF link annotation
    • http://cashbackk.site/how_to_use_jitterbug_lure8a3n0.pdfIn PDF document text
    • http://pinegobojefo.getenjoyment.net/spider_man_comic_cover_art.pdfIn PDF document text
    • https://monemoret.weebly.com/uploads/1/3/4/6/134667898/900545.pdfIn PDF document text
    • http://wersita.space/452602448888ylrp.pdfIn PDF document text
    • http://hookup750.website/a_level_biology_past_papers_ocr_2019ygski.pdfIn PDF document text
    • https://wonozonozosog.weebly.com/uploads/1/3/1/3/131398184/bdfca226bef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bagugexasorip.myartsonline.com/how_to_make_non-readers_read.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d94678f8-0e60-4cbf-98d1-7432a7030030/47531906924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd33b43a-4b61-4f7f-8891-e694285dc6cd/67008488687.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/pdf_english_grammar.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/70004471935.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/2224890264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa443733-b515-4c87-8fe4-98122b406562/sony_str-dn1080_best_settings.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/79596889482.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/test_completion_report_format.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/what_do_giza_dream_sheets_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64a900c8-af67-4a12-ac6b-b322b6f9b891/55714521098.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41B 5700 bytes
SHA-256: b8962edd106b8b7fa78278429d466048e2d5f36d66c7aff7b4e1a85528022415
font_01_sfnt_off0000d76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76C 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off0000e2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CF 10328 bytes
SHA-256: ee5b8bc92079b12a9cb74f19e1e310e03eeedf91230110bf3a09b1c75b8effb1

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