Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cfa0b9efd67b465…

MALICIOUS

PDF

79.0 KB Created: 2021-04-14 10:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: bbddf7bcf3be285828e8515c0827fc30 SHA-1: 136a9bbfb87649b8311785507924e4300e0362ce SHA-256: 7cfa0b9efd67b4652582cc41f121f9772934c00a1c29ab2f62631abf4a539265
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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. 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 0.9998

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 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://druttle.ru/strik?utm_term=how+much+is+illustrator+per+month PDF link annotation
    • http://dujegud.getenjoyment.net/brahma_vaivarta_purana_english.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446790/normal_60588522b2418.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404122/normal_5ff580a86a553.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496013/normal_5fcc53f9ea23a.pdfIn PDF document text
    • http://majusenise.sportsontheweb.net/unity_animator_tutorial.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wudemexa.myartsonline.com/delixurodures.pdfIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_87ae4fcab9a84378b37ba2ad7cce6e81.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nabifovu/midifefokiropoborimesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c4dc0f8-4763-4148-9b0f-1081eba5c065/literary_analysis_essay_sample_college.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/petowalazesepa.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/what_does_furnace_inducer_motor_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20080051-a5a4-444c-80bb-c39c1aab0a7a/how_to_text_on_a_doro_mobile_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/cyanogenmod_windows_installer.pdfIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_46a7d5c8bd8943d8b3056c66d9a2bc6c.pdf?index=trueIn PDF document text
    • http://mifedisiso.atwebpages.com/zutizebabavexise.pdfIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_28cdede03e024db4a00d1b129990da8e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/272228e7-7fd6-4759-b081-66fd90b5bf5a/besakasadetimebubevotewew.pdfIn PDF document text
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_ab0f52652a1d4c7bad78da8295f9c7d1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC27 5108 bytes
SHA-256: 4c125e6f685b19001e83da22fb89dcdda548e3ca55f1ff8756de0fddfbf1e287
font_01_sfnt_off0000fd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6B 10308 bytes
SHA-256: eb7907cbeab252f8d5439a732def9f3affc44f2a99000ee5b0c95f33ad17b3a7
font_02_sfnt_off000120c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C0 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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