Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c9619805ac38e1…

MALICIOUS

PDF

68.7 KB Created: 2021-02-11 16:46:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 40af03fd0ee8ec5b12f297834b2a12d4 SHA-1: 7ecfb48fe82c703a081a4977efdfecf82e8cfd70 SHA-256: 34c9619805ac38e141f5d55252a8bb48a2d66812811a754f1a19872474442d46
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://jottigo.ru/wix?keyword=surface+area+of+composite+solids+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370740/normal_60249ee77dabc.pdfIn PDF document text
    • http://buluzapigal.22web.org/xexemaxigenukizigutovefaf.pdfIn PDF document text
    • https://rilubaka.weebly.com/uploads/1/3/5/3/135303332/padorub_dokulirobilif_titeketeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393353/normal_5ffe4a5a345f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389816/normal_5fe2154ef296d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404969/normal_5fe6a02fdd0f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482625/normal_60251bc8294bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486220/normal_601c614382a48.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/dozore/agmark_certification_application_form.pdfIn PDF document text
    • http://mubidixosi.epizy.com/barfu_am_klavier_noten.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/spanish_alphabet_worksheet.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_off0000ce58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE58 5656 bytes
SHA-256: 188cf6d813ba132ff29ba2261ea9b27749dd5a4cbedd7d756ee0eabb067c2e98
font_01_sfnt_off0000e17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17B 10788 bytes
SHA-256: e2a635a65eb694cec47c10f381c8e0ef62baed8348819cd5f10ebe2cb883e06a