Malicious PDF — malware analysis report

Static analysis result for SHA-256 280b5afda423f5eb…

MALICIOUS

PDF

69.1 KB Created: 2020-11-22 19:02:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fee30bbdcae24c65575983e03936daf1 SHA-1: eb621fa5ba82618b2bf19d409be5fe0bdb5b1e76 SHA-256: 280b5afda423f5eb6f320c4212d1bbb7389443884add53225b25854faeb5e477
214 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics, including ClamAV and an ML classifier, and contains a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain keywords related to app downloads, suggesting a phishing or scam attempt. The presence of numerous external links, many pointing to PDF files, indicates a link farm designed to attract traffic and potentially distribute malware.

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
  • 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.
  • 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://gettraff.ru/123?utm_term=amazon+app+download+for+android+mobile In PDF document text
    • https://cdn-cms.f-static.net/uploads/4445337/normal_5fa1e5e01f606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377902/normal_5fa0374575760.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469370/normal_5fb71046e8341.pdfIn PDF document text
    • https://sizukejagu.weebly.com/uploads/1/3/2/6/132681884/7498156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478141/normal_5fa8d28b86633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386849/normal_5fb5b6295b8c9.pdfIn PDF document text
    • https://zufugorutamivas.weebly.com/uploads/1/3/4/4/134401118/pukufiz.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/400236.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/28d604b2-1145-47f6-bb5f-8961a6bbf868/forester_cinema_4d_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4664f898-e23d-4d6f-b27b-62fbee5ddcca/22029528847.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e42fd1bf-0840-4887-8331-40952317e5d4/johnny_tremain_audiobook_chapter_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bdcbe2e-0016-4461-8ae3-d12a5e2a3f37/niveguz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4331db05-48a3-402e-998e-9f0184290500/wwe_smackdown_vs._raw_2010.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_off0000d147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD147 5280 bytes
SHA-256: 7ff076b265cb472af42f8b754e5256d800d53dfb8906e84c259f67ac21f94c8e
font_01_sfnt_off0000e33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33A 10124 bytes
SHA-256: 963216e29ff8f3ecf86de0639e142436885000e93f0e2f98ba365dbded5d1415

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