Malicious PDF — malware analysis report

Static analysis result for SHA-256 64396b7f15e72d40…

MALICIOUS

PDF

74.8 KB Created: 2021-03-21 10:30:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a4a90b8dbc0af243d8f759004115560f SHA-1: 1dce6b5ffc0155f5da6e1fc0a88fd6d568d28d8c SHA-256: 64396b7f15e72d40711c20050564c135c790f33b366ec424439b871c17ac38f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ponafet.ru/123?utm_term=letter+y+activities+worksheets PDF link annotation
    • https://gizalikujaxemif.weebly.com/uploads/1/3/4/6/134606641/6630423.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474736/normal_602f25be6146c.pdfIn PDF document text
    • https://muzufuwuvul.weebly.com/uploads/1/3/2/3/132302955/8032840.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379498/normal_5fc90c49dfa40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413587/normal_60434f81dfb55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392649/normal_5fc990fc1080a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tolerikaduvutef.rf.gd/irritrol_kd6_manual.pdfIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_9c9e8f1545d14c9a9fc13a98e29e2ed5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/badodemebo/bleacher_report_nfl_power_rankings_2018.pdfIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_573091badbb742448f12a469380f3273.pdf?index=trueIn PDF document text
    • http://levewome.epizy.com/27756441112.pdfIn PDF document text
    • http://tivapatovike.epizy.com/savelujovaniki.pdfIn PDF document text
    • http://letutemoxeluz.onlinewebshop.net/platform_9_3_4_ticket.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/39422593734.pdfIn PDF document text
    • http://kojenixerog.myartsonline.com/acidosis_tubular_renal_pediatria_2020.pdfIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_fc1178125aea4942b05f2df8fd85295a.pdf?index=trueIn PDF document text
    • http://sidiwen.epizy.com/what_is_the_strongest_force_experienced_by_ch3f.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_off0000e724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE724 5112 bytes
SHA-256: 09f1dd9238f339b1920cb157c291e700ad715a51f1b9ebe5982a9724c5743c53
font_01_sfnt_off0000f8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A7 10588 bytes
SHA-256: 7245874d67d3e2f23ea98bb59ad8fe36e9889810181a9b00a61dc154ac9d3a7f