Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee99c3002a2acc1…

MALICIOUS

PDF

83.4 KB Created: 2021-05-19 23:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 42424fbe8ae35d37f5f6cab0f6d5c5c6 SHA-1: 2b614502bf6fa569976d5b82c122293ec2b90c57 SHA-256: 4ee99c3002a2acc12e6c57281d4a7b9228f87d921fd162ecba972cbd4940afb1
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body, though heavily corrupted, contains references to 'game assoluto racing cheat apk', indicating a potential lure for users seeking cheats or hacks. The presence of embedded URLs and the nature of the link farm heuristics strongly suggest an attempt to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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.
  • 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://resalured.ru/strik?utm_term=game+assoluto+racing+cheat+apk PDF link annotation
    • https://venunuwaxel.weebly.com/uploads/1/3/2/7/132740799/e89a09a1aa.pdfIn PDF document text
    • https://sulakupewub.weebly.com/uploads/1/3/1/0/131070695/gizubedumemuguz_serajenag_doxolikejutowad.pdfIn PDF document text
    • https://matamelo.weebly.com/uploads/1/3/1/3/131384575/7598522.pdfIn PDF document text
    • https://xofoxinef.weebly.com/uploads/1/3/0/8/130874051/gefejipu.pdfIn PDF document text
    • https://jiziweradufib.weebly.com/uploads/1/3/4/8/134847172/93923a.pdfIn PDF document text
    • https://netopanuneju.weebly.com/uploads/1/3/4/4/134493403/fokalud.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/lopeteb/tuzuje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f08749c-27cc-408f-9fc7-2bf864be55a3/73762330043.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0a39df6-042f-4ee7-b0be-736730923bb4/gobalegufud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b9dae90-52ee-4e85-8a85-4e3a650e7cd6/turn_photo_into_avatar_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a25ef015-4998-45dd-b0fd-74a5c6196313/libilopubosaxepiloporepu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/782425a0-ec36-4241-b170-112df727f3cf/81729762878.pdfIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/dss_sample_technology_control_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/is_graco_click_connect_car_seat_faa_approved.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30a8643b-7b0e-45fc-9473-38467cfc9724/dupus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f54f6021-942c-464b-8b34-f9df5ff95ce3/14154149900.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/bonivo.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/vibax.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/how_to_start_gas_fireplace_first_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10a2831b-3f64-47cc-88b5-6f72440d9c73/tijes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e20e03ec-ba49-4650-8d3b-e434473e14d1/magupewov.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/31357965508.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DF 5444 bytes
SHA-256: da83ab2381f5c45d02df3334861e60195a8053f5e6dc2a019d68d61fdaa8de82
font_01_sfnt_off00010638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10638 10460 bytes
SHA-256: 176a4d25bfdb054c712b3703cd5b7ede3c842f34346b7f506becab9256ba0a75
font_02_sfnt_off00012a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A47 16140 bytes
SHA-256: 00468df452218f546d59995a7cf9b4297092e2fd476dbd2f6ce79846bd051107