Malicious PDF — malware analysis report

Static analysis result for SHA-256 a321e5688a78b0f0…

MALICIOUS

PDF

73.9 KB Created: 2021-01-05 20:22:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 70aaad9903176ad074aee7c1a12c463c SHA-1: bc243d6e928817c177affa13f44cae7c3452109c SHA-256: a321e5688a78b0f0ed976fae1ba8732c3bbb6fdce0de710a30145ca91e6a2024
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains multiple embedded URLs, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong likelihood of phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection.

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://ggtraff.ru/123?utm_term=reflex+math+parent+letter In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377391/normal_5f8e7413bff4b.pdfIn PDF document text
    • https://tunomofezu.weebly.com/uploads/1/3/2/3/132303147/kotojimom_vukizivileta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453333/normal_5fb3769826446.pdfIn PDF document text
    • https://giboramogu.weebly.com/uploads/1/3/4/6/134627050/gidinenuju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476418/normal_5fc14a6188a39.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/b6338daf-3c73-4264-b35f-735fe78d7d43/95750228674.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/cleric_multiclass_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/939a2a85-7bf3-45e6-bcc1-02ebdf633f52/gadesupogagitonoregu.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/paint_texture_background_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c82af353-6cff-47ca-8b61-8767c67c88a0/comprar_favo_de_mel_em_curitiba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66d45b4e-8f56-4217-9b04-3c220c2cfec7/bufizubupemidemirod.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/informacion_sobre_el_bullying_causas_y_consecuencias.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_off0000e5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DC 5040 bytes
SHA-256: 86c923da040f9aed549d0a0b33237ad8927a41c310f919070c6b95dd71ec49d4
font_01_sfnt_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 10444 bytes
SHA-256: 2cdcdc001d4532a232f3587da5ccade79d1803a0ef4546aefa0e17e6696c07fa

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