Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c0571c0102590d5…

MALICIOUS

PDF

79.0 KB Created: 2021-03-01 05:14:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 42856e577cd8d4de0f51bc721d83a992 SHA-1: f8a03bf9bba7929a99921a88f65a7f6f59c18c1f SHA-256: 0c0571c0102590d5d4d17e7f19e8aaf4753d89a54e766fc44edeb75289654a14
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to interior design careers, which is then linked to a URL containing a similar theme.

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://dugedepap.ru/strik?utm_term=how+to+become+an+interior+designer+in+the+philippines PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485149/normal_5fdb2afaa4f5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450151/normal_5fce9e324e0f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422372/normal_5ffe98cc1dc3a.pdfIn PDF document text
    • http://tamekawarol.66ghz.com/27228054594.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/ifjasii/head_soccer_2019_unblocked.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/how_to_create_a_form_wordpress_plugin.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/wotifenibodamozexokeku.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/jsOGhjP/netflix_party_extension_on_iphone.pdfIn PDF document text
    • http://mekapetakosa.22web.org/gibigimabafi.pdfIn PDF document text
    • http://manovina.mypressonline.com/la_primera_constitucion_politica_de_la_republica_de_venezuela_1811.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/hbjaifP/fuwuwozedulijitapekoro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462351/normal_601f2221a29d2.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://ninanupazazudad.rf.gd/rh_isoimmunisation_rcog_guidelines.pdfIn PDF document text
    • http://pukadevimetuz.rf.gd/windows_10_1903_administrative_templates.pdfIn PDF document text
    • http://vilasatexovoxe.epizy.com/dexezorefatupi.pdfIn PDF document text
    • http://lupixopuvir.onlinewebshop.net/fighter_5e_fighting_style.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_off0000e813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE813 5468 bytes
SHA-256: de318fbc97ec47d8376fa254c5fd1a70dab746a3dc78f7d50f025c3e360662cf
font_01_sfnt_off0000fa7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7C 11112 bytes
SHA-256: 6d4a2abfec39253e3c7f072ffec6639e979fa24ec876a904ac09abc0f986ef71
font_02_sfnt_off0001200e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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