Malicious PDF — malware analysis report

Static analysis result for SHA-256 15cce16e3198a674…

MALICIOUS

PDF

79.0 KB Created: 2021-03-23 09:55:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 099a61828c3d9fdbaa2d8f6f6213f693 SHA-1: 5a2f40cc54aa261cf93b417ec0e0126bfa8c3f2d SHA-256: 15cce16e3198a674509b458da2e17f47ad6aada75272e9d6dd8954f6c4d5c8ce
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and hosted on services commonly used for SEO spam or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dugedepap.ru/wix?keyword=boston+official+bartender+guide PDF link annotation
    • https://cdn.sqhk.co/gujowaxexag/hbZhaij/all_recipes_sheet_cake.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/N4Hffgd/teacher_appreciation_gifts_cheap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428331/normal_5ff06aa67d457.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/77164726454.pdfIn PDF document text
    • https://cdn.sqhk.co/manoxixo/jdRI3hf/20490262265.pdfIn PDF document text
    • https://cdn.sqhk.co/rurizibaxami/YjcAhjC/orange_tree_imports_coupons.pdfIn PDF document text
    • https://cdn.sqhk.co/zinoliwomi/rzgfhgg/throne_of_eldraine_spoilers_mtggoldfish.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374196/normal_5fcddd0428f2f.pdfIn PDF document text
    • https://cdn.sqhk.co/duwokarewesu/gh2Hgh8/tovolowademazaporudewi.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwuxa/aPvXevg/web_designer_jobs_in_pune.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462035/normal_602c67c0cf969.pdfIn PDF document text
    • https://cdn.sqhk.co/guzikiku/Hwjehbs/pekunewonivuximevof.pdfIn PDF document text
    • http://wuxetij.mypressonline.com/sidizufusinogupif.pdfIn PDF document text
    • http://zesegalos.scienceontheweb.net/6852156011.pdfIn PDF document text
    • http://paxabak.mypressonline.com/1998600357.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8e12fe21-47c1-448c-af9e-883e7c84523b.filesusr.com/ugd/52ac5e_de06795960e84e52841e38b26e23225e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tugumeb/frp_bypass_android_7.pdfIn PDF document text
    • http://bebovufuvuji.myartsonline.com/93888741954.pdfIn PDF document text
    • https://25f35837-e8ad-4357-b490-8f69bec4165a.filesusr.com/ugd/96c61c_a822c5d654fd41ba94745329351e994f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/39797182668.pdfIn PDF document text
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_c94962e464c84e7aa9f846dd8417a639.pdf?index=trueIn PDF document text
    • https://52468903-0e2d-47c5-babb-61e1d305d291.filesusr.com/ugd/32777b_c894500d280c4605bb56d2e0a0a67d6b.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_off0000e863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE863 5376 bytes
SHA-256: fddd865e5e1dff41ccc64bcc61a310738849323713f55e76ee1dfaf49fd66062
font_01_sfnt_off0000fab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB5 2452 bytes
SHA-256: 8a1823444a5b6c3a07730ac8ec51e54113e1675a272bcd535278805140763c31
font_02_sfnt_off0001056e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056E 11440 bytes
SHA-256: b4d9e8d823a12d14311a95b05fabbf9bff374f77592659856608a61b9184fa10