Malicious PDF — malware analysis report

Static analysis result for SHA-256 e89415a63ce7b693…

MALICIOUS

PDF

68.7 KB Created: 2020-12-23 06:54:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8a5bf77cbb5966ad79d3bf428b3456ae SHA-1: 94859ead7e370e839df7084d89f24617db241c42 SHA-256: e89415a63ce7b69322cdf94c97f7bf264663b346a6df2f28ecf2f2ea76c4960a
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting or redirectors, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via the embedded URLs. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=schedule+e+2018+taxes In PDF document text
    • https://static.s123-cdn-static.com/uploads/4401989/normal_5fddaf342c28f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372985/normal_5fa793f2a674a.pdfIn PDF document text
    • https://sowameneritela.weebly.com/uploads/1/3/0/7/130775755/c04eefb9.pdfIn PDF document text
    • https://fabupegux.weebly.com/uploads/1/3/4/6/134689396/3678777.pdfIn PDF document text
    • https://xilamakiluf.weebly.com/uploads/1/3/4/6/134668497/fabesokixisaw-nezezi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fcead0f85e0c3327ca2d8fe/t/5fd01fd912264b5dfdc13171/1607475162781/join_clash_3d_mod_apk_rexdl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c08d530-dd86-4ff7-a9c5-868f97e1abff/maldito_karma_resumen_por_capitulos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26e5c0fc-4f48-426e-aca1-069efe3645a2/dinababeret.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/nanezekedadezom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c3f83e6-961e-42f9-951b-7c22b105a079/10308232870.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60de08ba-b9ca-476b-8c01-706974582ffe/25873959691.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1af1ca13a450babf9a140/t/5fc948b1b54438471376a98c/1607026865722/age_of_empires_apk_offline_mod.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_off0000d017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD017 5620 bytes
SHA-256: 33eb34cca4ce49b7104a313548904cc868fdb3186886b552a179e53bf8744817
font_01_sfnt_off0000e334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE334 10164 bytes
SHA-256: a0d707d2492cf65a23fface68086df59ac18ce2277c456f123769a69b53d4f86

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