Malicious PDF — malware analysis report

Static analysis result for SHA-256 2309162760e8b92d…

MALICIOUS

PDF

71.3 KB Created: 2021-01-29 07:22:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 55a24b0d3c8239a318884fde5a05cd59 SHA-1: e77ee7d65a3a7867d1248d435cfd49a9885a8976 SHA-256: 2309162760e8b92d6658a560fb4507ba2ca1d7c8738789642f094e7a3c73b189
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-optimized and point to PDF files, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains references to movie titles and application versions, likely serving as a lure. The presence of PDF_SEO_LINK_FARM and PDF_URI heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly indicates malicious intent.

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 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.
  • 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://bologen.ru/aws?utm_term=chakravarthy+full+movie+2017 PDF link annotation
    • https://bufuxilanu.weebly.com/uploads/1/3/4/4/134402831/494822.pdfIn PDF document text
    • http://nubebukexowi.66ghz.com/2644253855.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488135/normal_5fed3fc82c874.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383304/normal_5fc99c9d711c2.pdfIn PDF document text
    • https://kufavugozit.weebly.com/uploads/1/3/5/3/135309998/xugisefef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447669/normal_600b5fde8e62f.pdfIn PDF document text
    • https://wabezapodila.weebly.com/uploads/1/3/1/4/131437306/b30b33c.pdfIn PDF document text
    • http://nugekurobeju.iblogger.org/kettering_incident_episode_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454968/normal_5fd901ebabeda.pdfIn PDF document text
    • http://sovuxofi.66ghz.com/xujimumuvamejobozi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/savifin/dbf_file_format_reader.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/waybill_dhl_form.pdfIn PDF document text
    • http://rixexoto.rf.gd/analyzing_charts_and_graphs_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/aashiqui_2_song_free_video.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/1755943352.pdfIn PDF document text
    • http://lozisuvuxinosog.epizy.com/osrs_0-_99_crafting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/soundcloud_er_apk_latest_version.pdfIn PDF document text
    • http://dimuwebogikufuf.rf.gd/pavufemufemesomokilozegew.pdfIn PDF document text
    • http://zilapiwet.epizy.com/37358747175.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_off0000dafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFC 5368 bytes
SHA-256: 5fefde639ef314c1cc1a576022bbf7ece63eeb6ac8106f367df3928aaca22871
font_01_sfnt_off0000ed27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED27 10180 bytes
SHA-256: e22dbd5cd3bd90f3b0a638b4da2af4bdb82bfe75e987e4a892449ce1723cc420

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