Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c364d8f3dd3674…

MALICIOUS

PDF

58.2 KB Created: 2020-12-04 11:06:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4490ebc94f830495a76f4f3f39947254 SHA-1: 1e2eefb6e9c621c7a1704dab75b92611f2bd69c5 SHA-256: e4c364d8f3dd36748f89d5d81bd3f5736996f5a2703f5237c18c691e8832405b
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, and it contains a high-severity heuristic indicating it's an SEO redirector for free-download phishing. The embedded URL, 'https://trafffi.ru/aws?utm_term=multiplication+table+1-+20+worksheet+pdf', is likely used to deliver the malicious payload. No scripts were extracted, but the PDF structure and heuristics strongly suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffi.ru/aws?utm_term=multiplication+table+1-+20+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f8d385796afc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402932/normal_5f98f4a8a33d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372735/normal_5f9baf6710f0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447085/normal_5fa823cc08c94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384159/normal_5f9286301dd6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473403/normal_5fbfa50e00a20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413693/normal_5fc3d9bf94122.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/827fcee1-62fa-47a3-9815-7bd065389022/nanbendaa_havoc_brothers_mp3_song_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe26e1f81c9a2a0c6bb5d3/1606297314737/david_wilkerson_the_vision_and_beyond.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/fazolekatofojoxuseke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41dbb317-263c-44d9-80e4-1253488f411a/34909301175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3c24a87-7f3f-46b1-81aa-50988f896e0b/bixopoxaxuminoxunixazaj.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10dd611f6a419848684c6/t/5fc7b0643d56556d14468193/1606922340894/driftwood_kitchen_brunch_menu.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_off0000a7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7BF 5904 bytes
SHA-256: 096e3d7ed7b677ae9db83b40e004e44ea5f2b7737e56aec700cdacc463bf2857
font_01_sfnt_off0000bbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF1 8860 bytes
SHA-256: 58955216407c2db7bd1a6569ab5a94cf2531396ad5cefb9c1dde4f5ee43406ea

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