Malicious PDF — malware analysis report

Static analysis result for SHA-256 8816ed6515f6b790…

MALICIOUS

PDF

79.0 KB Created: 2021-02-19 07:48:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 722ba7e0662cea45437cfe1eba3fa01a SHA-1: 7055c8e28b66f35a780c8afba1f244d56decd3f8 SHA-256: 8816ed6515f6b790cd3d16cbdfc14de57c84645e4e577b87d4d464e931835705
126 Risk Score

Malware Insights

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

The file is a PDF that contains multiple external URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

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://jottigo.ru/123?utm_term=oxford+basic+english+grammar+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386330/normal_5fd600d89e752.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/jcijehc/jimdo_creator_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376598/normal_5feec6939e5ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445337/normal_5fd65a439081a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496001/normal_601c7a83927bc.pdfIn PDF document text
    • http://ruroraratotu.66ghz.com/6602288594.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457586/normal_5fcd9e057bf36.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://deketinak.rf.gd/wupagujepeledog.pdfIn PDF document text
    • http://nabarosurugi.epizy.com/nijuxijozofazafomudisoxid.pdfIn PDF document text
    • http://zekubegem.epizy.com/android_oreo_dla_huawei_mate_10_lite.pdfIn PDF document text
    • http://jaxurulefer.epizy.com/pesotomunufaruvemekoxake.pdfIn PDF document text
    • http://xizuzaziz.rf.gd/applied_biosystems_3500xl_genetic_analyzer_manual.pdfIn PDF document text
    • http://suvapik.epizy.com/72535925481.pdfIn PDF document text
    • http://rapuzivawa.epizy.com/periodic_table_hd_image.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CB 5868 bytes
SHA-256: 392677452e73fcb447b5c841842f97c52d14971329e2a1503c0c038c3beb60ae
font_01_sfnt_off00010b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B98 10336 bytes
SHA-256: 01d5573e26bd030bd0e8a56e1bd744dd0f72d88cebd09e642d3b223a52f41631

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