Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ba4bef3324f4e6…

MALICIOUS

PDF

81.6 KB Created: 2020-11-28 18:46:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4342407e03da5abb369c5e8b93268524 SHA-1: b374fb2cc5f19d26a203fbf94de6236fa1f3406e SHA-256: 22ba4bef3324f4e6259c582e74fd216c08cac22613ca268879b9c35bc3d43136
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains heuristics indicating it's a phishing lure, specifically using an image to redirect users to an external URL. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URI point towards a phishing attack pattern, likely aiming to download a second-stage payload or redirect to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/aws?utm_term=home+economics+curriculum+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494661/normal_5fc1f7ba9f856.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375339/normal_5fc06c9a0bc49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373992/normal_5f89e4419c976.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373004/normal_5f88a6ceb29dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422372/normal_5f9d6ce630b4e.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/c65d0f1b-0340-426a-b7cd-9ad311661e76/mega_upload_file.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/ragatomenepapabifimob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/162fc1c8-0cee-4d4b-9f5f-6d2d67890816/vezipobinolepelofuze.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/doduxejudupujit.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/68996766424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/016b7f39-6080-427d-925b-fc96c3e84edf/64738208541.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/bovanokelixuvedor.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/altar_of_secrets_download_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/autoimmune_hepatitis_aasld.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

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 5008 bytes
SHA-256: 12a09dc030513dfd80cfb5943954f38836874685ac8279091231ab0d296ea20a
font_01_sfnt_off00011160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11160 12188 bytes
SHA-256: 0d41b961853b11b0a4792b8c2f6be8789e5bd2ed872b9931d2a02487e4b4631f

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