Malicious PDF — malware analysis report

Static analysis result for SHA-256 3baf525d66c2d605…

MALICIOUS

PDF

71.9 KB Created: 2020-11-13 19:04:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f161a87548c54aa4d0f7824ef17f079e SHA-1: ebbbb800a58c0181ba6ef5a3ca28b9ac95f856fc SHA-256: 3baf525d66c2d60570b886833b9b8c4b421acb469e5041bb5dc2f56412aca544
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high-severity heuristic indicating it's an SEO redirector link used for phishing, pointing to the URL https://traffset.ru/123?utm_term=historical+investigation+examples. ML and ClamAV detections further confirm its malicious nature. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=historical+investigation+examples PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403264/normal_5f911002c3b03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378425/normal_5f9807730edf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414353/normal_5fa976605456c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_5f97caef7f280.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/38cf3b2f-0435-4456-afe1-7127f6dfc4b2/budugolakajuxis.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/87224174790.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/35244908573.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/81403709406.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b5b0ead-e244-4493-8443-771358c94206/11287154791.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b510cefc-6d62-4278-90c9-903ce7bbcd00/blank_printable_monthly_calendar_201.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6d3c402-e188-4f27-829c-87bb0e9bf566/futasumoroxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be825385-134b-42aa-94aa-6605dd692261/78078408902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efecd619-d097-4c46-8607-1776cb2268ef/49909709501.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/powered_parachute_flying_handbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ad02ed0-35d4-47ff-86ad-bbb851847140/43705066941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9539709-d428-4f65-b13d-729809568e00/86128279395.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_off0000dd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD21 5344 bytes
SHA-256: 078e02419fa5d1a8df7d6aa48a671aba3e1ac3af7621f09f2ccc0abac84e64bb
font_01_sfnt_off0000ef42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 10256 bytes
SHA-256: ea290ed8c7dbe640605f56f86f9de481457ae842b68cf8bbd5aa66b22a0df98a

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