Malicious PDF — malware analysis report

Static analysis result for SHA-256 c351b01acf7e72ee…

MALICIOUS

PDF

85.9 KB Created: 2020-11-17 10:41:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: c4a6066975748ec2a5803893fa30ebde SHA-1: 989a767597fcf807aa7cb5af19b64c7462512ba4 SHA-256: c351b01acf7e72eea533048e170af7f6ce0683ba48d65c1a00bd5683117f9f83
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=torka+aldrig+t%25C3%25A5rar+utan+handskar+watch+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416151/normal_5f994f6c63aaa.pdfIn PDF document text
    • https://nadazilagola.weebly.com/uploads/1/3/4/3/134314388/a9e4f2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417216/normal_5fb37117620f5.pdfIn PDF document text
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/najuwik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371514/normal_5fa85b8a1f96a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369626/normal_5f8a0aafcafc5.pdfIn PDF document text
    • https://finiluxexolije.weebly.com/uploads/1/3/1/8/131856594/zekekapemunarigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491925/normal_5fb322e751384.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391305/normal_5fa3417142da3.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/21e21420-b0f2-4fdb-a269-fc45042015f8/batazivuwusovavulonirufad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/901e1f0a-3506-476a-9e6b-4f30b5954e2f/tenifetogeletirobesivug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c56fa65-7c4b-4b8d-9774-e746d890f507/lolitak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/222e31bb-546a-4e63-8599-c62aaa33cd7f/brain_and_behavior_garrett.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF9 27056 bytes
SHA-256: c5a32a0bd1ed7de973b9931edb4afca1c1f1b82cef2c843b84aecbfc241123cd
font_01_sfnt_off000110f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F4 5612 bytes
SHA-256: 892e4db0712d4b8ee9535070a2c671ce524b788fb8d5c082376f020a0bccd9b6
font_02_sfnt_off00012379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12379 11096 bytes
SHA-256: a3b2fcee947b3e4cc2528cabe3832642456c1219f8f52bcc13ab31c1a89c781f