Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ebd8e9a6f3614f4…

MALICIOUS

PDF

69.1 KB Created: 2020-11-24 14:49:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 42f450d920c4da76293e6b0aaa89e85d SHA-1: 19f9f456ab9485ab270abdad21d7d639a3cdd34e SHA-256: 4ebd8e9a6f3614f460e6a1f4b42519a2fa505de88d64c9553fbcbd756cbb9aa1
214 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, and contains numerous links to external PDFs. One critical heuristic indicates a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, but the presence of many external links points towards a link farm or redirection strategy.

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://traffmen.ru/strik?utm_term=trifecta+oilfield+services+midland+tx+address In PDF document text
    • https://nevofegef.weebly.com/uploads/1/3/4/8/134851200/simakudepe.pdfIn PDF document text
    • https://sujajikozodes.weebly.com/uploads/1/3/1/3/131384638/4351543.pdfIn PDF document text
    • https://jiwamotezonadiw.weebly.com/uploads/1/3/4/3/134325797/porowim_zanojet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446759/normal_5fa1270b5a702.pdfIn PDF document text
    • https://vorujefam.weebly.com/uploads/1/3/4/3/134322124/5619555.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/7f8af35a-139a-4e49-9849-1c2743037efe/filibuster_ap_gov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4b1cf5e-c678-40ac-8a46-95bc53769a50/kedipuzoxewa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6f13e99-a4e6-4e21-9ca4-f4826036e439/duzevobejujuxonom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/465c81fc-0650-475d-9191-7123337770b4/70063046624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80b28668-20b7-471b-aa18-5a606ec2f32f/the_dictionary_of_body_language_a_field_guide_to_human_behavior.pdfIn PDF document text
    • https://s3.amazonaws.com/wisatutadi/megedilufinudoxava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ec4fb90-8867-4e51-ab1a-f96209236c45/30127116553.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/bootstrap_studio_2._7_free_with_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4e1876d-b77c-4e7c-af30-37f6a9fea5eb/sapud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b108a66-3c76-41eb-af2a-6575aaf49cf6/v_de_gowin_formato.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_off0000c312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC312 5032 bytes
SHA-256: 98d6d0e7c6b8fe8500d506ad1bf60a459144595006cd703a3576ebf46b150b4c
font_01_sfnt_off0000d410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD410 10884 bytes
SHA-256: 282178c9c4717124045a4bc1b7628ad45b40595e61212cf8a63e9791623d53a7
font_02_sfnt_off0000f954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF954 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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