Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d639b4b46630c63…

MALICIOUS

PDF

69.7 KB Created: 2021-03-18 11:36:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d875298b9aebf5347ee0ae54b5018449 SHA-1: 367730c8d46e565523251404c43c917f3a552b98 SHA-256: 0d639b4b46630c6360f7158aaf396e4ec1b373241e68c91eb79fbb3cce0192a7
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://kuzutuzo.ru/wix?keyword=protect+your+nuts+2 PDF link annotation
    • http://turistik-a.ru/zizujafesujexajukocbi41.pdfIn PDF document text
    • http://indital.fun/advertisement_template_psdvx7j1.pdfIn PDF document text
    • http://rawenspant.online/dotuneturetvwzeo.pdfIn PDF document text
    • https://tumizoma.weebly.com/uploads/1/3/2/8/132814974/524934d6c6.pdfIn PDF document text
    • http://circleshtang.xyz/used_scag_mowers_for_sale_craigslistnfqxp.pdfIn PDF document text
    • http://leree4.club/15072027748ym9jm.pdfIn PDF document text
    • http://static-start.top/pajigiwitabegifulupovuq4s9f.pdfIn PDF document text
    • http://uuuuull.space/notepad_compare_files_online3sd15.pdfIn PDF document text
    • http://itdiscount.info/pes_2020_pro_evolution_soccer_apk_obb2zwk8.pdfIn PDF document text
    • http://fullstacket.online/why_is_positive_discipline_more_effective_than_punishmenth6kxm.pdfIn PDF document text
    • http://wide-mean.top/acer_aspire_v5-122p-0408_specs4jhv4.pdfIn PDF document text
    • http://vereffka.xyz/revizekovovimavavizib0c.pdfIn PDF document text
    • http://damvglaz2.xyz/59228282808op35s.pdfIn PDF document text
    • http://poroda.site/schlage_keyless_entry_battery_changee04m1.pdfIn PDF document text
    • https://nagejezesalu.weebly.com/uploads/1/3/0/8/130874580/jikufuxefepuvufuf.pdfIn PDF document text
    • https://sazavilekin.weebly.com/uploads/1/3/4/8/134851962/3993a8140e.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/f9dcdf3073422.pdfIn PDF document text
    • https://zivogozupitis.weebly.com/uploads/1/3/1/4/131406352/6087d0eaf5e2.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/2da66cd4-2dab-4187-9cb4-af162c7c03a6/how_to_put_ps4_controller_into_pairing_mode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8a4a8ac-fb89-4253-8c10-dde8653800c4/fesasedukiwal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69d0c48e-788a-43fe-91e9-172e1663d764/2002_buick_century_limited_oil_type.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c053563-9723-4d06-973d-0d8ffa9c67f1/how_many_discs_will_ff7_remake_be.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/609c948f-6c2e-4daf-a494-818021bde7fe/can_you_download_gta_5_on_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0528527e-77c5-4616-943d-25c3718a7aae/ps_i_still_love_u_songs.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_off0000d523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD523 4784 bytes
SHA-256: 5e67e0084cc5c612ab0ec6bf7e5379ea7156770c253a53bb24f688030b715c28
font_01_sfnt_off0000e588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 10548 bytes
SHA-256: 4622e184039c6f8c06e265c96117b38c52be9f03ddcdd0267ca399f48d5a0aaf