Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb355f0d72f6b55…

MALICIOUS

PDF

65.6 KB Created: 2020-11-12 13:58:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: cd43d8dfa532c0e0b662182e599f2a65 SHA-1: 2bce431a2fb127b3e02325a7137fd38c6445139d SHA-256: 8bb355f0d72f6b5507118424a9798ad9033ed242dc9996136d79ece633440629
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/123?utm_term=how+to+set+up+a+wii+to+a+smart+tv PDF link annotation
    • https://zirenujunez.weebly.com/uploads/1/3/4/4/134431605/miselovek_sefekenemalud.pdfIn PDF document text
    • https://nonuvatemex.weebly.com/uploads/1/3/4/4/134443968/5225734.pdfIn PDF document text
    • https://gozuneputir.weebly.com/uploads/1/3/4/3/134345179/5357830.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/4378045.pdfIn PDF document text
    • https://lujadogube.weebly.com/uploads/1/3/4/5/134522393/8057247.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/subud/aashto_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/potuxabol.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/buenos_aires_mapa_turistico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd9813ac-2242-4f0d-84b7-0f3365fdcb02/80008262261.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/50498877704.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12ab9143-1c93-41bd-993c-d817449803a2/81272269985.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb1dda7a-a504-44d2-96bb-f6448f019ac3/xipevelenonugisirizasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d1718a8-5d19-49fd-adfa-1e936d41a04f/46541612419.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.

FilenameKindSourceSize
font_00_sfnt_off0000c6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A0 5044 bytes
SHA-256: 6533860c0faff57cd0a37598cec5c792d3c916cb5bb0d1f5dd2bcfd1d063a0d1
font_01_sfnt_off0000d7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C6 10048 bytes
SHA-256: ceba3f7669ed1b4a0801f55e36b6c8dddba07288ff6d09ba1c2a0a461c0e05e1