Malicious PDF — malware analysis report

Static analysis result for SHA-256 365d84cf70d4dd4e…

MALICIOUS

PDF

70.3 KB Created: 2021-01-16 03:01:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e98aa1c4ed56d3c6c99bb06aa46bff5c SHA-1: 9affde5dc5e01c611fe9ed51f69746613b895e2c SHA-256: 365d84cf70d4dd4e0ef64c31b7c98c71a45ed9a8176bf8b1e1a00edf3961a301
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF containing a link to a known malicious redirector, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The PDF also contains a large number of external links, suggesting a link farm or SEO abuse tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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://cctraff.ru/123?utm_term=table+tennis+near+me+to+play In PDF document text
    • https://romemigevowuf.weebly.com/uploads/1/3/4/3/134335991/jepibijalomago-lujewixudot-gopetugekaza.pdfIn PDF document text
    • https://dodawuwaxa.weebly.com/uploads/1/3/4/3/134305805/wifekazumi.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/NjirjbH/borulajami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376098/normal_5fd64e13140c2.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/aqIqWjh/71902004676.pdfIn PDF document text
    • https://cdn.sqhk.co/vudemijugamu/SgijMia/derwent_coloursoft_pencils_72_wooden_box.pdfIn PDF document text
    • https://buzufurabobozu.weebly.com/uploads/1/3/5/3/135304208/zenuwufeb.pdfIn PDF document text
    • https://tenikekiso.weebly.com/uploads/1/3/0/7/130775729/jorotideminen.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/hjN5gjj/kugetiluramumajapowe.pdfIn PDF document text
    • https://gawosiluzetur.weebly.com/uploads/1/3/4/6/134631715/5308f575bb.pdfIn PDF document text
    • https://noromilo.weebly.com/uploads/1/3/4/5/134587763/4703792.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mipizaju/differential_reinforcement_of_other_behavior_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/apl_materials_latex_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/90359359754.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/81615875695.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_off0000d5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BE 5156 bytes
SHA-256: ea036eb0c71aa6ad8912bc96c3a2459a863538324416e2f059bb3a62661b44c9
font_01_sfnt_off0000e734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE734 10816 bytes
SHA-256: 18727a26961a209903add4bd3f32916ffd080a363350df8a6955369657eff70e

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