Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72c81c5bcb05e61…

MALICIOUS

PDF

77.5 KB Created: 2021-03-15 14:56:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 023dd47c7c7f43ad1c868fdccf26baee SHA-1: 551505d870d43797a31e3283eea7abbf06e1e297 SHA-256: c72c81c5bcb05e6125962a00409c21daaebd03a807c03197f5a16b52c2bb0501
184 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector infrastructure, which points to a gambling-related website. The embedded URL is designed to trick users into visiting a site offering a "free slots mod apk", likely a lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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 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://yafferge.ru/wix?keyword=doubleu+casino+-+free+slots+mod+apk In PDF document text
    • https://cdn.sqhk.co/fukonovum/Liiuhfg/war_alert_red_lords.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453575/normal_5ff4101d48f2e.pdfIn PDF document text
    • https://cdn.sqhk.co/nupozifulija/nicwehi/tabletop_tactics_twitter.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468253/normal_5fee7bc7d34ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481667/normal_5fd348255182f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459774/normal_5fe6d05011834.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469370/normal_602cd9c598214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474222/normal_600b7183da478.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/MjdeJhh/battleclaw_game_beast_generator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465565/normal_602c596aa0d6f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/donake/accp_pulmonary_nodule_guidelines.pdfIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_75866775f3764245b06d8426f15cef52.pdf?index=trueIn PDF document text
    • https://1b2c4efd-c8eb-4b04-b26f-b9154d704720.filesusr.com/ugd/d3758e_4d06ed9d77e140eca45e58ebce8271bb.pdf?index=trueIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_bb855277b3f34a1c9dc25d83ccd1d707.pdf?index=trueIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_26648566a8774689a6bf04d0ac3c8c64.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f77e942-09d7-4a45-be09-9211066f4f6e/zewakolak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b0354ee-56a4-4d41-a581-3d9bf073e27c/kenurubumesapiwarolasabuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d035be31-e14b-406f-afa0-ec8bc3a2b729/wetugali.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/ariens_snowblower_24_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad079b25-cc3e-41cd-82c2-8e6da8112121/among_the_impostors_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12311096-e756-4e4b-ad85-cbcaed0ad132/la_ciudad_de_los_perros_pelicula_completa_online.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE413 2960 bytes
SHA-256: 3a99bfcc8a6322cb1f5d9dd0c76c95525b0630114fc12c53a342d41e6b6e0e01
font_01_sfnt_off0000ee83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE83 5536 bytes
SHA-256: ac3bd56b2cce774d344051f1780b61def9b38dd8c45e905a2e353fc1ce22380a
font_02_sfnt_off00010148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10148 11408 bytes
SHA-256: 6792b800f873d5ca1fa28c6c4e1440305bb131cf7d757ffb1cbce0639e17a24b