Malicious PDF — malware analysis report

Static analysis result for SHA-256 025cd519355e7a94…

MALICIOUS

PDF

80.5 KB Created: 2021-03-29 03:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 806c5af903ea67b6c6b430673f2aa3ab SHA-1: 562285c28b15b4ffa330ba59d22a76441450ad8a SHA-256: 025cd519355e7a94b45fc6185624c07bd2c013a50341101d96c4caa89e7e3ba6
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 0.9990

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://mezovuduw.ru/award?keyword=klasifikasi+anemia+who+pdf PDF link annotation
    • https://cdn.sqhk.co/jarogofef/hhgMMhi/small_business_accounting_consultant_job_description.pdfIn PDF document text
    • https://cdn.sqhk.co/powurejur/ha4ggw3/fasotuf.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/iBjhhaX/13118820731.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunaveb/ghiaiid/cookie_clicker_3._0.pdfIn PDF document text
    • https://mizunawakore.weebly.com/uploads/1/3/1/4/131406356/f203681edc5.pdfIn PDF document text
    • https://cdn.sqhk.co/pikikunifav/id4bKdU/49982942656.pdfIn PDF document text
    • https://cdn.sqhk.co/jadepibake/jRgii8O/gallery_63_auction_tv_show.pdfIn PDF document text
    • https://pajoxobonojizo.weebly.com/uploads/1/3/4/7/134702513/287581c1a4.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobuwaxegu/oqhejfb/neogeo_x_gold.pdfIn PDF document text
    • https://cdn.sqhk.co/letopoto/it2fxzM/xyron_sticker_maker_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/wareberefiz/iayTjdU/troll_face_quest_tv_shows_level_14.pdfIn PDF document text
    • https://seruborakumew.weebly.com/uploads/1/3/4/8/134849990/fejomelugepu.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/idhhwja/94474941563.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_7805a53d569e43cd81a07a6e3462730e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/banula/puwexunije.pdfIn PDF document text
    • https://2e21b658-2967-4279-8f18-a03590b678a5.filesusr.com/ugd/f5e1b2_b9c4639681d44b8fa58bff8d46f586b4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ragejufa/spider_solitaire_game.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/paworafejiwesekojatozu.pdfIn PDF document text
    • https://6b21c484-99f8-4e97-b77a-b77c054bfe5d.filesusr.com/ugd/f139d4_520cb4e5e14a474a90c012cffd5cd3ba.pdf?index=trueIn PDF document text
    • https://31e64076-56b3-4e53-9780-179364fbad2f.filesusr.com/ugd/d8d3cb_d7d92334cb024f5a961e0e414b5f7a5b.pdf?index=trueIn PDF document text
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_86aa6175e44b4946b875f91a77c8e129.pdf?index=trueIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_1b13f33e33c746b19210818d74f0752c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/invoice_template_for_services.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/lonugogovupaxozalifevatav.pdfIn PDF document text
    • https://0443db59-9f9d-4031-b786-8a5723798135.filesusr.com/ugd/ab62d6_47c5e69b02d240598834558e5d8433f6.pdf?index=trueIn 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_off0000f11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 5016 bytes
SHA-256: e0437a496f776a35788c9deb0fdf0d4f1e9973b0b375dfbd42196fa6d71c55cc
font_01_sfnt_off00010208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10208 10828 bytes
SHA-256: 285d734b0e7e27f26fb692a6e20200e6798b91d092ca8914b0155f5691c6b5ed
font_02_sfnt_off00012623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12623 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3