Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff266e8162b859e1…

MALICIOUS

PDF

77.7 KB Created: 2021-03-24 07:39:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 130c48129c1732bcc050ef4057506b11 SHA-1: b951e0e128785f5f84e383c7ec7d03dc5f0a311e SHA-256: ff266e8162b859e120cf0a0783e926c975fb192371affbf580cc373c1f06a4a7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are associated with link farm heuristics, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/strik?utm_term=kenmore+ultra+stitch+12+sewing+machine+parts PDF link annotation
    • http://max-lifting.store/karma_guide_probuildsjj92v.pdfIn PDF document text
    • https://pamaxorakumi.weebly.com/uploads/1/3/4/0/134019068/barevegafitumedogexa.pdfIn PDF document text
    • https://cdn.sqhk.co/bikugipozamu/gfJQnOG/vr_360_horror_movies_download.pdfIn PDF document text
    • http://profer-opt.ru/nobitirojevefuderalir51s9.pdfIn PDF document text
    • http://parrrtner.xyz/rinenigafixinomadofasogiwz0n16.pdfIn PDF document text
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/7a2b41.pdfIn PDF document text
    • https://cdn.sqhk.co/bajowekununa/ghghifJ/chores_meaning_english_name.pdfIn PDF document text
    • http://cadenalia.com/acknowledgement_letter_for_thesishjwiw.pdfIn PDF document text
    • https://cdn.sqhk.co/nabokufawogo/f3eMjew/williams_pinball_official_website.pdfIn PDF document text
    • https://cdn.sqhk.co/lunapolakezo/jpsjasL/file_hide_android_app_download.pdfIn PDF document text
    • http://sodahub.pro/zoferapetanotjab5.pdfIn PDF document text
    • https://mujilaku.weebly.com/uploads/1/3/4/3/134389228/43daa35.pdfIn PDF document text
    • http://texno3ua.com/9630316309841pcy.pdfIn PDF document text
    • http://expo-kit.ru/what_kind_of_memory_card_does_a_garmin_gps_use7vxbx.pdfIn PDF document text
    • http://kushtanash.ru/visual_dictionary_free_downloadcrbmu.pdfIn PDF document text
    • https://razejegunejedad.weebly.com/uploads/1/3/1/6/131636834/9649944.pdfIn PDF document text
    • https://xaxuxogupovugid.weebly.com/uploads/1/3/0/8/130874119/gufogimexod_kalonip.pdfIn PDF document text
    • http://nat-fru.space/laxuzolovesz983.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/994a25ab-66ea-408a-a971-9019c4efc02e/dell_precision_m4600_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6f70387-fec8-4902-a07b-09a593b38777/can_you_airplay_on_a_samsung_smart_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c105822-e450-4a35-ad68-e326649a980b/17925812750.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea32cc1e-0039-4495-b809-9fa6d9147ac0/sony_alpha_a350_digital_slr_camera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/128912eb-a8d1-408d-86f1-fe519a910a74/what_is_the_best_business_to_make_millions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79c54495-763c-45b8-a1f1-2439ad1a01db/hayward_pool_heater_gas_pressure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5495a25-9509-4fde-8a1d-4ddcb2082c73/how_to_write_a_performance_review_of_your_boss.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_off0000f1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 5592 bytes
SHA-256: e3dfac3ac75f9d12037632e67f0946d021b51c2ab1cdac25cba05667a4970c8d
font_01_sfnt_off000104e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E2 10608 bytes
SHA-256: 6396a6502a59104a2b25bd5caddaff146e72c971d6903bc4e92656ab4b36280b