PDF malware analysis — malicious · b4f796af0ef22bfc

MALICIOUS

PDF

66.3 KB Created: 2021-02-18 00:38:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10

MD5: 743ea8b44fc26bf3511ebb7d01953e01 SHA-1: 64e6e7498bfb26c2c0d742346c3bf06499b08033 SHA-256: b4f796af0ef22bfc90b5ea79245c80a7fa85d22ee9bfacaa92f7b9089a5628bb

136 Risk Score

Machine Learning

Nyx PDF Classifier malicious score 0.9996

Heuristics 5

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://baarspo.ru/wix?keyword=thomas+sowell+basic+economics+4th+edition+pdf PDF link annotation
- https://cdn-cms.f-static.net/uploads/4460708/normal_5fd777ac1f662.pdfIn PDF document text
- https://cdn.sqhk.co/dejuxafe/Nsloiau/xoberipufobagusose.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4487186/normal_602d972b76a4e.pdfIn PDF document text
- https://vopupina.weebly.com/uploads/1/3/1/0/131070761/9601633.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4391921/normal_5ff2d5d01d6ca.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4374953/normal_5fcbe2e1cc088.pdfIn PDF document text
- https://cdn.sqhk.co/gevajoke/ggagdl5/bike_game_free_download_app.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/rotowan/clipmaker_3_apk.pdfIn PDF document text
- https://s3.amazonaws.com/popilo/cengage_physics_cp_singh.pdfIn PDF document text
- https://s3.amazonaws.com/faxaxos/denton_county_police_accident_reports.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c6bc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC6BC	5568 bytes
SHA-256: `9804b1071b202744b4dfe0d6debc33146cf938a1db349fadcfdc96fdf3e6fc8c`
`font_01_sfnt_off0000d994.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD994	10088 bytes
SHA-256: `849b7b6d16cff45514d316c0ce0310c891e1560dc93f82570e0583b0aa8ff368`

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