Malicious PDF — malware analysis report

Static analysis result for SHA-256 f171b58536ff8346…

MALICIOUS

PDF

69.8 KB Created: 2020-11-29 06:11:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ee6f4df94ba459478d799fd953a3208a SHA-1: b6e791948776d7335d0d1ba3daa340df5df026b9 SHA-256: f171b58536ff83467f76e62a1122783d8febafda2fbeeda04a23688fcbe0ca2f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high number of embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO-based traffic redirection. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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://traffmen.ru/123?utm_term=how+to+write+a+persuasive+letter+to+your+parents In PDF document text
    • https://dibodowe.weebly.com/uploads/1/3/4/6/134686502/fovodiwilagas_zekojekigiran_kixirejinuzub_wasegosew.pdfIn PDF document text
    • https://firaxefa.weebly.com/uploads/1/3/4/6/134694685/5a8960851e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527042/normal_5fbfcfe8288c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_5f8d4fda513f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414173/normal_5faa23d2669bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371265/normal_5f88606e48f4f.pdfIn PDF document text
    • https://levibuzoj.weebly.com/uploads/1/3/4/4/134444272/xigifakejetof-tuxulofemupali.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://s3.amazonaws.com/zazelujeju/26517553650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b49044e9-57df-4f84-9d1c-73bc3c34d590/fortis_campus_link_portal.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/adobe_illustrator_animation_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/ganavoterabefipegada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/920ac83b-7180-48c4-9c27-894d0883d24b/gunoxojeninediramegaf.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_off0000c8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B9 4908 bytes
SHA-256: 5e0820664433f71e71750a4d754f11518d2e0837d1e94eea540099c8ac928091
font_01_sfnt_off0000d987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD987 10240 bytes
SHA-256: 083e13cf6e8722688a15d73c21b5fad764a79237df9f607adcc773eda4ee9c7f
font_02_sfnt_off0000fc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2A 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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