Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d9b1b9b4deb068b…

MALICIOUS

PDF

74.2 KB Created: 2020-12-27 08:00:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 606497679a0c36d05561e61b68d08a34 SHA-1: 11a1c7f15195499a9dab1ced8a5e101dc8b144ba SHA-256: 9d9b1b9b4deb068b26bf25f3463c09bb193994aecc1d35cb47a0cf31c0f02bb2
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URI and a high-severity heuristic indicating it's an SEO redirector for a free-download phishing lure. ClamAV also detected it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=future+tense+worksheets+for+grade+5 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494138/normal_5fbed108043de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418970/normal_5faef7a5833a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392451/normal_5fc3ca1ebbee8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463263/normal_5fce93aa0ffb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5f9a5debe8021.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451545/normal_5fe4da310d2fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426944/normal_5fc33a2e9600c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369324/normal_5f8e3ea07509f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f95b15e7d028.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392472/normal_5fa88ac6cb925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495039/normal_5fd28bf93b872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446642/normal_5fa29e9246b42.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/66045113-41de-4787-bc5e-40e2e612032a/juego_de_guerra_de_barcos.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/dumubamoxibogo.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_off0000d795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD795 5208 bytes
SHA-256: d402fc6b6847fd35dcda295674b3c46fc7a24bddff8bddc8ba73211891a01964
font_01_sfnt_off0000e95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95A 10816 bytes
SHA-256: b5bc9fcc095d520cde18591ceee4aa6e901498ade9b796fdea6928e63ab1c336
font_02_sfnt_off00010ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DED 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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