Malicious PDF — malware analysis report

Static analysis result for SHA-256 533cb81998adea69…

MALICIOUS

PDF

67.7 KB Created: 2020-12-16 16:03:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 65c9ed4e09db423a00a67d815dd3bf79 SHA-1: c05b4b222c54dd41835e3071a2953a22cedd7de8 SHA-256: 533cb81998adea69ca4e9ea8b97c9c6995c78d92530edb219b54169285b3aa56
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains multiple links to redirector infrastructure, specifically identified as a malicious redirector and an SEO link farm. The primary redirector URL, https://traffking.ru/123?utm_term=getting+ready+to+negotiate+pdf, is a strong indicator of malicious intent, likely for phishing or distributing further malware. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?utm_term=getting+ready+to+negotiate+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f9bed9316139.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402944/normal_5fd808f320d35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369671/normal_5fa055630c68e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408851/normal_5f9c073862573.pdfIn PDF document text
    • https://juvirafiwak.weebly.com/uploads/1/3/4/3/134307718/0e77e.pdfIn PDF document text
    • https://bujasosepamus.weebly.com/uploads/1/3/4/6/134626994/f815c41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379046/normal_5f8c8d1de615c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fce2aea564f736a582ffe04/t/5fd0f621f2c8bc1b29a4face/1607530025296/22732935637.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eda23c6-b598-4b44-88c5-fa8302fd0d70/furadapetofivufikisudatab.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_off0000ca94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA94 5132 bytes
SHA-256: e07d44d01061d93c27a61040b9993e8ba3099ba4f1bcc847cf08c2fb36d26fa1
font_01_sfnt_off0000dc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2B 11252 bytes
SHA-256: f86e259e4396f1f5a17d8859b93a5031852f4e25527a7cc5b7f9534897c8034d

Open this report in the interactive analyzer, or submit your own file for analysis.