Malicious PDF — malware analysis report

Static analysis result for SHA-256 94ef2e607178754d…

MALICIOUS

PDF

78.7 KB Created: 2021-03-05 19:44:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 502b2b514b7626dde7f30fa7dd67c509 SHA-1: e2b5edb5bea8a1c5c72fc359bfb1d64411c40aea SHA-256: 94ef2e607178754da4629f064b9624a901db211bc9d8eba841504ef13ae49dae
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common tactic for SEO manipulation or distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous external URLs suggests the document is designed to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Malware.Agent-9978918-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Malware.Agent-9978918-0
  • 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://jottigo.ru/123?utm_term=occupational+therapy+manager+5th+edition PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416790/normal_5fc7eae30113c.pdfIn PDF document text
    • http://fazoluniguket.iblogger.org/52200176982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416787/normal_60298b2258b95.pdfIn PDF document text
    • http://gunudatur.22web.org/vitamaster_treadmill_vintage.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461202/normal_5ffbf2b54a167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445130/normal_601806a5f3ffb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423750/normal_6017b58b7332c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366317/normal_5ffa7a46d8fc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450140/normal_60346eebb1d9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444369/normal_5feee0d1d38b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_603d83332df6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490365/normal_5ffeabdb31379.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469351/normal_60054e88d2800.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c69a8150-bb1e-4c46-878b-fc1622391bd7.filesusr.com/ugd/cf91d6_9b7fe104527b41e98f4484a3658e7736.pdf?index=trueIn PDF document text
    • http://fusuxitizubuka.epizy.com/blender_human_model_free.pdfIn PDF document text
    • http://biwodonugawodil.rf.gd/free_online_english_level_test_with_answers.pdfIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_3a9efb15796742c89455f6ff1393dd24.pdf?index=trueIn PDF document text
    • http://lofopeba.rf.gd/20705502546.pdfIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_3c0c725ab69f4bcfbcc04aab6a5b0d25.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e20fffe-f352-43ea-881a-517e59c162af/zugikus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8305773-dc68-4621-b3e1-8e6fbc5cedde/will_kidde_and_first_alert_compatibility.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/141fbdc3-43fc-4c9f-99d9-f8a09adff9f5/enterprise_architecture_as_strategy_ross.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE085 5560 bytes
SHA-256: 341dcf532cd200e8d233ac8deefe3c3f8935a13e4bb9024755f375eacaf05f82
font_01_sfnt_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 10748 bytes
SHA-256: fdec2e12b67d8a2d9c4eb96276d0fc52f3bf135f70615c05999ccf9f49c6df92
font_02_sfnt_off00011824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11824 16084 bytes
SHA-256: 6793135c9d5f2d9402216549edf66541f87ac1c2d7f717693568b2625ec966b3

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