Malicious PDF — malware analysis report

Static analysis result for SHA-256 1886bf884541a1b9…

MALICIOUS

PDF

71.2 KB Created: 2021-03-07 18:29:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 5dd6de5f198c2f0f27cb34684e2e3d2d SHA-1: 2d486e9a174b062f8e1691ef7018822f55134b2a SHA-256: 1886bf884541a1b9b03580191e883e4f9376e6ddbe19421a75ca0db32652b1a9
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://dugedepap.ru/award?keyword=h+nmr+spectrum+table PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414672/normal_6031114ef371e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496378/normal_6012e9be51808.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369626/normal_5fd260e0ae1d1.pdfIn PDF document text
    • https://gilawidukawopux.weebly.com/uploads/1/3/2/7/132741225/5b264169ba13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445106/normal_5ff360447845b.pdfIn PDF document text
    • https://fotofewoxa.weebly.com/uploads/1/3/4/8/134849098/7536424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475727/normal_603192930630d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450723/normal_5fdf0dc1da20b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485942/normal_60237d83b2305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369322/normal_5fe956a598115.pdfIn PDF document text
    • http://tozofuji.scienceontheweb.net/us_navy_eval_closing_statement.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449187/normal_600ca6fd7adb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416143/normal_60269bbd55a02.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xutenujute.myartsonline.com/ralasex.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC538 5180 bytes
SHA-256: a83d5f75b4d37c7928764aee57ca10f87cefc53ef4da52caac062dc35add9012
font_01_sfnt_off0000d6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B6 10060 bytes
SHA-256: 8d43d1a4d2b121fe9313ed9060d437965b7de88f0576a68ae2ec2c8dcbd05a92
font_02_sfnt_off0000f960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF960 16144 bytes
SHA-256: f6e0f4a25f18a144688c6b7f40519a5efc98c72643b9054f89526e396d9b459d