Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e9a66f83180cc3…

MALICIOUS

PDF

73.1 KB Created: 2021-02-08 08:55:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 2e0cfe317b0f80ddf41084a01e09ead7 SHA-1: a5268e8f48b430995001f5ef6776a6f8ab9e3f34 SHA-256: 58e9a66f83180cc30f1cc6a88ce6af6b15039fdc58e97a358a8119fc12470ce7
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jacksth.ru/aws?utm_term=influenza+cdc+treatment+guidelines PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495271/normal_5fd60c4747c7a.pdfIn PDF document text
    • https://sekanawejizi.weebly.com/uploads/1/3/0/7/130738855/7bbd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495526/normal_5fd7160835f63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469828/normal_600dc7b6983eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448346/normal_5fe310c5aef05.pdfIn PDF document text
    • https://cdn.sqhk.co/vovusupa/Ijgjd87/tee_birdie_flyer.pdfIn PDF document text
    • https://birivisixakaxe.weebly.com/uploads/1/3/4/6/134608058/523850.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474988/normal_5fdbd55db86ef.pdfIn PDF document text
    • https://guxenebulofoto.weebly.com/uploads/1/3/2/8/132814975/kekuzafare-lidow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/46191676348.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/autodesk_maya_2018_full_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/56419871787.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/liviwexitixi.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/kimuvok.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/toyota_aqua_2016_user_manual.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_off0000e1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DB 5328 bytes
SHA-256: ae1bf3eeee83d5d037e18c37c0767cc3a1f986e4e4993767a0f22aab9463fbe4
font_01_sfnt_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 10544 bytes
SHA-256: 63686e35ed102bbb8345c3efedd13b3ec383970968ed1d9412bda3978ae6dc51