Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff996a64f439148…

MALICIOUS

PDF

79.4 KB Created: 2021-03-18 00:20:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: d60a75d159039bec78f398fdc433fe7e SHA-1: 15f281e36dedf2f16598434751602caa66cef0f8 SHA-256: cff996a64f43914862523223839b24ff4a371b511f717680265ae8e2074731ec
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting it functions as a link farm designed to redirect users to malicious sites. The presence of external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=best+drum+beats+hip+hop PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427282/normal_603afbec9f1f1.pdfIn PDF document text
    • http://mexuzekinukogip.iblogger.org/hootsuite_social_media_trends_report_2019.pdfIn PDF document text
    • http://popegajinetulez.iblogger.org/abn_form.pdfIn PDF document text
    • http://webomiwizux.22web.org/barkate_ramzan_whatsapp_status.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367297/normal_600872cd364da.pdfIn PDF document text
    • http://nezowigivomi.scienceontheweb.net/84116910910.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443595/normal_5fdeab479fe6b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naxufiregukorer.rf.gd/bugeref.pdfIn PDF document text
    • https://94cb5446-44f7-499c-8ddd-8d9df3a2db3d.filesusr.com/ugd/9b9c26_5475945a69404487b4db9637f7972468.pdf?index=trueIn PDF document text
    • https://3caa4030-7dd6-4be4-8a8a-e1981c45b3cd.filesusr.com/ugd/704988_7b6d68a73b344b33ab8e92521b44804b.pdf?index=trueIn PDF document text
    • http://sadozejeko.myartsonline.com/2013_subaru_impreza_wrx_wheel_specs.pdfIn PDF document text
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_aaedbefe37814b66b0cdfd2d7df2b2a3.pdf?index=trueIn PDF document text
    • http://jebamuvenital.rf.gd/23941570020.pdfIn PDF document text
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_a032388d068341838d1efdcce5c44269.pdf?index=trueIn PDF document text
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_e485abc019234823a0ca1f6780ab7c67.pdf?index=trueIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_fb8b09107f7a4b1894ff51d41fbaa754.pdf?index=trueIn PDF document text
    • http://lulikeleweworup.epizy.com/customizable_free_printable_boarding_pass_template.pdfIn PDF document text
    • https://8319d365-0190-44ee-b2f3-e76f6fd230eb.filesusr.com/ugd/112488_44eca915ffe449879c931eaa0115c0e8.pdf?index=trueIn PDF document text
    • http://jasigobup.epizy.com/sijusuxij.pdfIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_ad46adba3be94e0e82f8a61fcfee5528.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 5356 bytes
SHA-256: b9ea145c8c6084376c263d32101746513c07a31a67bab1d419086c678a18eff1
font_01_sfnt_off00010a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0B 11208 bytes
SHA-256: 83d7704d5e0dea542bb0ebf92655c15acabefaf469266789722328187cb3b345

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