Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a776d3c7782cf0…

MALICIOUS

PDF

366.9 KB Created: 2020-12-01 06:23:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b66d3bf1896c5cb1cdc51dc9d33ac599 SHA-1: 2e30a6a27f178b4662934061165e1f4545780dc3 SHA-256: b8a776d3c7782cf0f905e5d2f08f78ffeb0c86577597201f143cd996ca48e1e1
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9703

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ggtraff.ru/123?utm_term=after+twenty+years+summary+brainly In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426830/normal_5fa22b08ecc8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f8ce1d3040b2.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/3ce57d4e8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420903/normal_5f9b17b9ce476.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/901855ef-8457-49b3-bcab-9c37e7c61f14/32108095702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dc60097-dbdd-4ed2-bb4e-f63c5f05bd70/bmw_1_series_m_coupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50ab6e6f-32ef-4e2a-b5bc-070f9e0c35e8/wibisazuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e443c217-821b-4b59-894c-16db9782ffa4/dying_light_save_file_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b22a9af0-63f9-4f8b-b8be-0b9737eb4555/dfo_witch_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83e8da0e-610c-4258-9bb2-e9e2b22504ca/by_og_byg_anvisning_200_vdrum.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_off000571ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x571EA 5236 bytes
SHA-256: 1d4a5338f82378a85d68851395cbad331f231d6fe94df72d96057a2ee9523cca
font_01_sfnt_off000583bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x583BD 11736 bytes
SHA-256: 81251f61f4d81591d2b89d3f75e214fa8099b28a301e4cfe744644917dd9a56f

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