Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d1e7044ddd820a…

MALICIOUS

PDF

80.5 KB Created: 2020-12-16 18:03:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ec9558e6f4ef50d9fea4785fb15eff61 SHA-1: 703cb66e325874b7f59887d57d5daa8123796208 SHA-256: 12d1e7044ddd820ab1f9dd7e0f47676190b3e758fe1322fb4932966811d9e60e
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of many external links suggests a link farm or SEO poisoning tactic to obscure the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/123?utm_term=basic+rules+of+writing+poetry In PDF document text
    • https://sazejibapox.weebly.com/uploads/1/3/4/8/134863873/jazalutudisas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369330/normal_5fbfd84780091.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382974/normal_5fce3f58c0d66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367674/normal_5f8a7d261fee0.pdfIn PDF document text
    • https://lewugudufe.weebly.com/uploads/1/3/4/6/134668986/3bc667a9bc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443809/normal_5fb532865e218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369935/normal_5fd16408e062d.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/bbf0a5bf-3a0e-450d-8fdb-5c8794287272/39109529329.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe2f287acac6192a8ade44/1606299434193/sword_coast_legends_ps4_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/26478441977.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c81c0df5-c773-487a-8eb5-6ef46d0ea72f/novuvuzafesekezope.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/83206323487.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f89c965a-3a9e-496d-b9fa-fce1db9c7e50/68480081376.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_off0000f143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF143 5308 bytes
SHA-256: cb5ddd5f5605f37499ad49587d0cb09a3df9a4ef45eabe8406099215d432b562
font_01_sfnt_off00010372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10372 10508 bytes
SHA-256: dd5f3c5a809900e8ff4fc54007d1fab824b5869860323d74fb3143f3d4ec1a3c
font_02_sfnt_off00012711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12711 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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