Malicious PDF — malware analysis report

Static analysis result for SHA-256 145233ea1ab0d188…

MALICIOUS

PDF

41.2 KB Created: 2020-11-09 11:13:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9478f759d3dbc684e72cbdec1ebb80c2 SHA-1: b839ae6784cb413cbbc5d5eb25abd19efad487c2 SHA-256: 145233ea1ab0d18853006b7197bb64bebeca27eae24d16968e532560480c700c
76 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains an embedded URL that redirects to a phishing site, masquerading as a free download. The ML classifier and heuristics strongly indicate malicious intent. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://traffset.ru/aws?keyword=areas+of+knowledge+math PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366311/normal_5f874051544ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_5f9e72f1844bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377674/normal_5f8cfe67a141f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405652/normal_5f9b636602016.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427501/normal_5fa585eec9173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368243/normal_5f966549e90ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_5f9e4b731e6ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fc4a7eb-fbe5-434a-90cc-ff774b85b786/zozekakomat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f89dd22d-c314-48b3-976f-f162c5a06fbf/47433095135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dc64632-d8a2-487d-88f5-9d4a255fb9a3/risajutinajixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1e41d16-1376-4bb0-91a9-a4be70028074/duvejegigiwirifepak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67d8234c-0a5c-4ee5-96e2-08ffc73b6121/rpg_vx_ace_rtp_install.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caf8e9e8-d0e2-49dc-968e-9fe610b5e749/65015823902.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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60DC 5464 bytes
SHA-256: 1cccaaa3a1279ebe3a8e6de6f6a4aa866ff857940c5f5d0abde1941a2472f152
font_01_sfnt_off0000735c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x735C 10544 bytes
SHA-256: 61c53f6f64f0799fdbf55a1a4c4138d2f1d3703003eaf97349f28ec2f7d27484

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