Malicious PDF — malware analysis report

Static analysis result for SHA-256 908d60aa7f232f77…

MALICIOUS

PDF

73.5 KB Created: 2021-01-31 17:14:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 36c464dd5cd501c93e867e261456b265 SHA-1: 9fcf57c76232cb161581ce4bf8b14f226d2d89cf SHA-256: 908d60aa7f232f77aad17fce64076a3033a82918ad55bd4efdef4c3a07da799c
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://druttle.ru/123?utm_term=is+avast+cleanup+premium+worth+it PDF link annotation
    • https://zimolitavok.weebly.com/uploads/1/3/1/8/131856331/0eeb5abbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4531626/normal_5fee3891b283f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385410/normal_5fd071316e98c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452206/normal_5fd340cb319c9.pdfIn PDF document text
    • http://vemasujananexu.22web.org/5948515780.pdfIn PDF document text
    • https://jedewudozoj.weebly.com/uploads/1/3/0/7/130739070/biwitakolasuxigo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482625/normal_5fdc2722a28f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388825/normal_600b70188380b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393638/normal_600decbdc2727.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372101/normal_5fe29e992c73c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379491/normal_5ff61384c175d.pdfIn PDF document text
    • http://gikadoketu.iblogger.org/anthropological_thought_venkata_mohan.pdfIn PDF document text
    • https://wolofineso.weebly.com/uploads/1/3/4/5/134598063/da7f1bfe44e0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491969/normal_5ffba3fe8c1a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lakuxizutigevo.rf.gd/diagramming_verbals_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_off0000e2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F0 5264 bytes
SHA-256: d212cbab398ac6d60e3c424eb9352d0341ae86c6032bb0c7942b69626f29ed16
font_01_sfnt_off0000f4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C0 10752 bytes
SHA-256: ffbf94a9dc350c0b349ec7db082f768a9398c598c557c41bb4fe3bba6d3bc1ef