Malicious PDF — malware analysis report

Static analysis result for SHA-256 583161256ef66df3…

MALICIOUS

PDF

79.7 KB Created: 2020-11-25 00:57:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cf702703718d887b7f7d344d45b97a40 SHA-1: dcaef772d0d93dd7a2be59ab82e5b02e383cd5a9 SHA-256: 583161256ef66df37167f4ce06f61e0a0d605781039366ac329232e80fde0665
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, identified as a link farm and an SEO redirector, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URL 'https://trafftec.ru/strik?utm_term=p90x3+fitness+guide+pdf+download' is likely part of the lure to download further content.

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://trafftec.ru/strik?utm_term=p90x3+fitness+guide+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375528/normal_5fa5d83f7829f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378383/normal_5f8abc188dd81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f8c726d23999.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389586/normal_5f989804eacd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446782/normal_5faed7b97b38f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449395/normal_5fbb45e78b980.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/916016.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459784/normal_5fb3dd0d441b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bcce431-5470-4f77-ba88-d430e8dadc20/debijukubodufob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72d3fc7d-b1ba-44c6-9dc2-ce15c28e33ea/textos_discontinuos_ejemplos.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/20319537106.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/529f352b-1a3a-40aa-8b9b-828c4482d9b6/fexugasoraxitogamodasoser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bb9394a-5e5c-43e8-a8dc-1020a3610432/fedizidewedafo.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/revista_atualidades_2018_2_semestre.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD23 5736 bytes
SHA-256: 9b67a1dd22b38430c64f7f8bf67eb9e0825ffd2a8956ff8d58cf36431b037407
font_01_sfnt_off0000e0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CE 11932 bytes
SHA-256: 1723a2b2a41d1540dbf181fab4bf45328aaa8ebce6bec68a5a9af9a4456ae21f
font_02_sfnt_off0001029c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029C 13964 bytes
SHA-256: 7a19fe28c9e14e023a434d183a68f58c67ab13d85f0a734527fbef18ff3f5222

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