Malicious PDF — malware analysis report

Static analysis result for SHA-256 d962ef905f1ba4ad…

MALICIOUS

PDF

78.0 KB Created: 2021-03-16 07:40:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 62278837d2bc9b7d1b1cc14217ad0123 SHA-1: ffc005a6a4e10c8bd2879b48f6fd409abc9ec7de SHA-256: d962ef905f1ba4ad32113f43bc45ffeba4c091cdf8249ae60c788f195972238f
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting or unknown reputation sites, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links, likely for SEO manipulation or to distribute various malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/strik?utm_term=the+fallout+book+wikipedia PDF link annotation
    • http://aycotoro0.xyz/us_history_shorts_2_big_business_and_the_monopolyl33ir.pdfIn PDF document text
    • http://fatutidajipen.iblogger.org/blue_book_car_value_guide.pdfIn PDF document text
    • http://wide-do.top/52616766154dty1h.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/98624396621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366395/normal_6048e87669612.pdfIn PDF document text
    • http://kigumelez.medianewsonline.com/advanced_dungeons_and_dragons_adventure_modules.pdfIn PDF document text
    • http://becloud.website/wulitorotewujolonagukerewebfd5.pdfIn PDF document text
    • http://flowerport.shop/62463547326zhr7r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454055/normal_60386e61bc8ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408709/normal_6022a0325f2a6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://terezeso.epizy.com/spotify_premium_free_apk_apple.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/668c1f0c-9d4f-4344-a555-525092cb1981/xapebo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/653566cc-cc45-4f41-9f26-f620ab87afa0/ludiwubu.pdfIn PDF document text
    • http://tuvilijemuze.epizy.com/activesheet._protectcontents_false.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b29a459d-6aef-46f8-908f-56dd81b9e514/lenovo_thinkcentre_m82_drivers_for_windows_7_64_bit_download.pdfIn PDF document text
    • http://ridezaxepaked.rf.gd/selodadixigifabuwobaj.pdfIn PDF document text
    • http://vonolukover.epizy.com/meningitis_treatment_guideline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe4e664a-5858-4a26-bf49-de9a4cbf3589/2012_jeep_grand_cherokee_service_intervals.pdfIn PDF document text
    • http://jalozuxir.rf.gd/zurok.pdfIn PDF document text
    • http://gawebunopom.rf.gd/sifewomerurasebibar.pdfIn PDF document text
    • http://zokepufa.epizy.com/accounting_101_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87f0dc92-908e-42e2-968a-fa27d11df07c/sepaj.pdfIn PDF document text
    • http://bibobega.epizy.com/adblock_addon_firefox.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_off0000f191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 5100 bytes
SHA-256: 9f161e8099d626ce7636988ec462a2235af185b2ff1b5f30b01c3b3a25f5d78e
font_01_sfnt_off000102f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F9 11248 bytes
SHA-256: a6c3ad3e61e5d1f83ec987d39be8f9dd5f3b0f7d6ce06b7a136268ed380d8e64

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