Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2bbe6b24589234…

MALICIOUS

PDF

75.0 KB Created: 2021-05-13 16:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 40ee0c8e4db134d3941e305388bd470c SHA-1: cf1d675fbdb141ca6526eee19db8550c58633f76 SHA-256: 4d2bbe6b24589234260b00b6da2766746739288ef42a2b416ba0e041371529a9
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The document body, though heavily obfuscated, appears to be a lure related to appliance repair.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://resalured.ru/strik?utm_term=how+to+repair+a+stacked+washer+dryer PDF link annotation
    • https://xebutalumibafa.weebly.com/uploads/1/3/1/0/131070398/vopula.pdfIn PDF document text
    • https://zakewurez.weebly.com/uploads/1/3/4/4/134471700/ragof.pdfIn PDF document text
    • https://megoximigiwuboz.weebly.com/uploads/1/3/4/5/134579220/duxor_woguzubitevux.pdfIn PDF document text
    • https://goneduxif.weebly.com/uploads/1/3/0/9/130969586/kiwisoluwatamujozo.pdfIn PDF document text
    • http://lulodexov.scienceontheweb.net/company_introduction_sample.pdfIn PDF document text
    • https://kunamugak.weebly.com/uploads/1/3/0/7/130739026/bedb0c3c.pdfIn PDF document text
    • http://lewijufe.sportsontheweb.net/wejexiwedovivurufemikew.pdfIn PDF document text
    • https://mivetemadika.weebly.com/uploads/1/3/4/4/134471856/digaganunewal.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/wiperevexuvozuvitodeva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_9531d9524a4a42fc8c7baa26bcdc6081.pdf?index=trueIn PDF document text
    • https://8e2462c3-2f66-48cb-9487-448a5f38467c.filesusr.com/ugd/c345b0_03058290b32b4147b9a78c1708499882.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/47997052727.pdfIn PDF document text
    • https://9b56c271-8e60-4ff0-96d1-8930f8c082f8.filesusr.com/ugd/5a1ab0_7cc34bd7bdd049869cbc095f898bb289.pdf?index=trueIn PDF document text
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_7cc1a8644fcb4ec1b54a14c9028bd5fd.pdf?index=trueIn PDF document text
    • https://245df057-3761-468b-8bc4-2c9c6734f7c7.filesusr.com/ugd/06c8e1_c43bab1f12964047a7681572cfa0457c.pdf?index=trueIn PDF document text
    • https://e8e87dc5-637d-47ba-9de6-e7d98d123d78.filesusr.com/ugd/a69a03_d476503cbad24050833cd8ca647e0999.pdf?index=trueIn PDF document text
    • http://larovitivejel.atwebpages.com/assinatura_digital_linux.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/62453179602.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/premiere_pro_cc_2017_transitions_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/how_to_use_xender_on_blackberry_classic.pdfIn PDF document text
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_87f9784112c349ff8b59d29fed7d75f8.pdf?index=trueIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_e8df773b1c1348328a555c33570bf20d.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_off0000e829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE829 5348 bytes
SHA-256: 72a88e7fa746015d913f69be18afece8c4e1bfc5e7a5cdd1c94a65bfd1e60af8
font_01_sfnt_off0000fa60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA60 10588 bytes
SHA-256: 9327a77efd02282ba93f76295ce86dc2d2ad0b82f041592ee41f2e8ad38cffb7