Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e12f55017522c7…

MALICIOUS

PDF

68.2 KB Created: 2020-11-10 21:20:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9fad5e61fb74b4c6230fc524737f52af SHA-1: 93172bca0ae03d55f260398336acbd6967371f90 SHA-256: 16e12f55017522c71923f387081e1d620f0cb6e63b54a6a7036fb91731345e73
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with a primary redirector URL pointing to a 'free study guide' lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and heuristics suggest it's designed to redirect users to malicious content.

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?keyword=free+study+guide+for+the+giver PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393644/normal_5f93cc2570aa7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375896/normal_5f94343704f4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384046/normal_5fa6171660702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460232/normal_5fa15eeb87ca0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401994/normal_5fa10718a2b08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384828/normal_5fa559c94696b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403537/normal_5faa282d00496.pdfIn PDF document text
    • https://bigogewoxof.weebly.com/uploads/1/3/0/7/130739615/4aae0fbffd5a87e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476150/normal_5fa941594c3b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393761/normal_5fa4ea166a247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366346/normal_5f8952d4292e3.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/jenisozazewubo/54276014031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4c85b37-0b9c-40d7-b1cc-d648358aec2c/jaxiredaduz.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_off0000ced7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED7 5044 bytes
SHA-256: 30b0a6b0a729c74d438a6ade3c19faf76b8d9b1ff51cec7c2e7d9b47c634724b
font_01_sfnt_off0000e00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00E 10572 bytes
SHA-256: 243579303fa359183e57720c36a34e4bd389462061b11b7f30f18d6eefaa7311

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