Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53b459c20c38ca1…

MALICIOUS

PDF

75.4 KB Created: 2020-12-19 01:51:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 99dac7080137e3cad8222f321a6a993a SHA-1: b2405d30705465ad8609e4d73fdde85e812c2211 SHA-256: d53b459c20c38ca15c5a5abb1cab7e0e35165a83a64a6dc6ac022caf2315758f
156 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 external links, many pointing to other PDFs, suggesting a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/123?utm_term=ki+hong+lee+net+worth PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420602/normal_5fa775b85a0eb.pdfIn PDF document text
    • https://gotenalonas.weebly.com/uploads/1/3/4/3/134372716/3924834.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_5fa23f089ccbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409255/normal_5f986dc30b113.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/9b9f0dc9-70c7-41d8-9855-dc21247bbe96/sexabad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9789a11a-010d-4bd2-a055-67710eb9ec4c/38105674976.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/mevinuxawabesalo.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/bixakaki.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/pekuji.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/kgb_archiver_kuyhaa.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/rodibodabiripo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF86 3112 bytes
SHA-256: d6bb73c9e6141b5ee02a964e7446d083ae7171487319112cc69a4eb1ec9e7bd9
font_01_sfnt_off0000dab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB8 4408 bytes
SHA-256: db812bca3cfee3acdeb2298df37265dd50dae9e19e66a0b3c8eb217b88e242ff
font_02_sfnt_off0000e9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AD 12464 bytes
SHA-256: 06a5ccda1236411e8df6737cf2ed56edb7185c7e3801382dfe0ffa9ddfe4bb5c
font_03_sfnt_off00011290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11290 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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