Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5c5619080ce5ca…

MALICIOUS

PDF

74.0 KB Created: 2021-03-15 19:42:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e722c0dd3d0b84974a0ddeaf33dd8365 SHA-1: 3560a7b3480088553bd4b811d07d7cdd7fa7ae61 SHA-256: 6f5c5619080ce5cafbb91a4229c860eab00b8e3fa8317e14212db9af1bee1991
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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 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://leonvi.ru/strik?utm_term=graco+snugride+click+connect+35+vs+chicco+keyfit+30 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462075/normal_5fe5e8476f8c6.pdfIn PDF document text
    • http://coolvdomaion.online/tixudarovoke7aqkg.pdfIn PDF document text
    • http://pasikufopubiwo.mypressonline.com/un_curso_de_milagros_leccion_279.pdfIn PDF document text
    • https://nidiladidubupa.weebly.com/uploads/1/3/4/7/134753920/a0fc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412570/normal_5fff7ed426255.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471704/normal_5fc8cec72f3c0.pdfIn PDF document text
    • https://dufibivi.weebly.com/uploads/1/3/5/3/135346242/bonumapegani.pdfIn PDF document text
    • http://eushopvmn.site/vizio_sound_bar_connect_to_philips_smart_tvdrjqt.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/one_minute_manager_book_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414864/normal_60485cd66fd2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457281/normal_600a3c95eb880.pdfIn PDF document text
    • http://leledup.mypressonline.com/debiz.pdfIn PDF document text
    • http://dikegebe.mygamesonline.org/vexasofalekenowupopu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370555/normal_60333da59623b.pdfIn PDF document text
    • http://scandisvet.ru/286902544073n3ze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_93451bff04a044cbb9d831e0be376cba.pdf?index=trueIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_623ff77d74f2430b8cc79e913fa6a370.pdf?index=trueIn PDF document text
    • http://dirazonun.myartsonline.com/amadeus_peter_shaffer.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_off0000e111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE111 5968 bytes
SHA-256: e5c0d2cff7e8c528cbb711d9d33d5a3cad4fa2e8c4c303dfd6e5a7c2f1558062
font_01_sfnt_off0000f570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF570 10712 bytes
SHA-256: 0ebb78864b410721ad2b478871e1ecde2717da7f707b56cbd036f7d99b16f735

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