Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef69a26998effe3c…

MALICIOUS

PDF

77.1 KB Created: 2021-05-12 09:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 552342c4a12312ac965fff8633545931 SHA-1: 73a21d4d724e1a9e396d5ef25775cb73ae28f9ca SHA-256: ef69a26998effe3c985a86e88f420fafe12d815d1af561b26c587f8bdafc69f7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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/strik?utm_term=play+settlers+of+catan+online+colonist PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462982/normal_5fe96153b1a10.pdfIn PDF document text
    • http://motarojetox.sportsontheweb.net/linularagolob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393019/normal_603999f12894e.pdfIn PDF document text
    • http://jurojegame.getenjoyment.net/conjunctions_worksheet_5th_grade.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487184/normal_5feb3dc7651ef.pdfIn PDF document text
    • http://kewokuxumuzig.medianewsonline.com/61333381495.pdfIn PDF document text
    • http://kidupat.getenjoyment.net/czasy_teraniejsze_i_przesze_angielski_wiczenia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484114/normal_60567830dcce2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493266/normal_6000a1905691b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462035/normal_5fc877abbcd09.pdfIn PDF document text
    • http://tojuvapemupo.mywebcommunity.org/abraham_maslow_motivation_theory.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406473/normal_6064854f4faff.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
    • http://kivarutumo.myartsonline.com/insuficiencia_cardiaca_congestiva_signos_y_sintomas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/461a8b18-e81e-4bb3-b4b9-f709210b4e53/66343325763.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0918c4f7-a7e4-4157-8621-2402c1870c59/brother_intellifax_4750e.pdfIn PDF document text
    • http://ruvemad.myartsonline.com/open_file_in_browser_html_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6af2b972-ef4c-4c2b-90a9-dfc160a525c3/forutejarawef.pdfIn PDF document text
    • http://xidalagep.myartsonline.com/kogirekigagawutefe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE247 4764 bytes
SHA-256: b2c80cc82ca3a849beb57012c8d25490da545726cc2ebece39292b6d49fa8eb8
font_01_sfnt_off0000f283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF283 11600 bytes
SHA-256: 93a4b9d94ec1a2a6f81045e67fa8a54b20d420d1277d62e3e2fc9690b62ef261
font_02_sfnt_off00011927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11927 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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