Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b52da8e4224dc5…

MALICIOUS

PDF

75.8 KB Created: 2021-04-20 23:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f783416862a673485711b0b4d3e05ea5 SHA-1: 8b9dffb4f9ec79e2754fc6036d22f7218fc20e7d SHA-256: d8b52da8e4224dc5b433fc4ac5ad7e88d7404b12121f2c5909c7eb0f5b882013
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://botokaw.ru/strik?utm_term=pema+ch%25C3%25B6dr%25C3%25B6n+books+pdf PDF link annotation
    • http://memisada.mygamesonline.org/binary_addition_and_subtraction_rules.pdfIn PDF document text
    • http://zujewubowufonug.scienceontheweb.net/punctuation_definition_and_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/folamudoj/dljijhc/samsung_voice_recorder_apk.pdfIn PDF document text
    • http://dodajavux.scienceontheweb.net/6120308780.pdfIn PDF document text
    • http://delinapod.mypressonline.com/bibowomir.pdfIn PDF document text
    • https://vuzowukuz.weebly.com/uploads/1/3/0/8/130814197/c31a827a.pdfIn PDF document text
    • http://kobivoweder.mypressonline.com/topology_network.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/kilalesi.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/zxgc6jd/medieval_war_hammer_weapon.pdfIn PDF document text
    • https://zogazipo.weebly.com/uploads/1/3/2/3/132303407/99b49e9c76ba543.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_15fd6055eb334edab4d21136d4b52a08.pdf?index=trueIn PDF document text
    • http://wudazebej.atwebpages.com/design_and_analysis_of_algorithms_tutorial_free_download.pdfIn PDF document text
    • https://aca292c6-a3ee-4c96-b4c9-db15c8eca1b9.filesusr.com/ugd/cd1d52_60b832479d7b4f12805fb753893579a8.pdf?index=trueIn PDF document text
    • http://gixufedexakav.atwebpages.com/77722325736.pdfIn PDF document text
    • http://kivarutumo.myartsonline.com/64134044903.pdfIn PDF document text
    • http://fumibilulad.atwebpages.com/70989164954.pdfIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_a4292c05015741cf85ffdf0d9d547a36.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_off0000e647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE647 5708 bytes
SHA-256: c8ac6b459792eeeab5e3d0532fb5f95df321b8edb31b1c8a0526b05d851c8a59
font_01_sfnt_off0000f93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93C 11548 bytes
SHA-256: d8130316876621eed43feecbfb38bd65bd02df831b3736544cd512341be979f1

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