Malicious PDF — malware analysis report

Static analysis result for SHA-256 a515c4a8e4a6c335…

MALICIOUS

PDF

76.7 KB Created: 2020-11-11 01:12:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1fec25e78f21bc0adff68602e4cd0554 SHA-1: e767f7349b35e0f90e600694b8cc980c98cf4181 SHA-256: a515c4a8e4a6c335a4e4c6af53d7e4038d6fcb9ae5c7d71fef1d3ad4828f7b16
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on Weebly, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful content.

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
  • 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://trafficel.ru/aws?keyword=october+31st+weather+houston PDF link annotation
    • https://kafubururi.weebly.com/uploads/1/3/4/2/134235359/5bd5d24ad.pdfIn PDF document text
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/desikukinoviv.pdfIn PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/pajiveluz-befoxofo.pdfIn PDF document text
    • https://xedusajid.weebly.com/uploads/1/3/4/4/134444225/sosirenufil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370278/normal_5f881a952d455.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/lewuli/dental_floss_holder_metal.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/christianity_for_kids_video.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/mewevinorob.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/pogelibawel.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/sonujesugotejusakejanup.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/41373592989.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/neoplasia_mcq.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/41103299735.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/dishonored_safe_codes_art_dealer.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_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 5388 bytes
SHA-256: ba4ec38155f8b49eedbdadb061ec329240a5aac6a25e44924eb13ee7c830f0fc
font_01_sfnt_off0000ed5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5A 5328 bytes
SHA-256: 674caa97211a5d3317b53e8d97bd603cad1a22e5f4f393ed4b2112f66a9df1ff
font_02_sfnt_off0000ff84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 10652 bytes
SHA-256: c41d841f86ad00a0b72ce3a2c080f4bceddc89e76574f8f9581f8490c3919259

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