Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5503ca4e113c52…

MALICIOUS

PDF

80.6 KB Created: 2021-01-11 11:55:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b747917c7bfb734aabf5bedfcfbea84c SHA-1: e0d40d6a953c4b802deae43cf7075767cc87aba0 SHA-256: bb5503ca4e113c52e3dc3695961a991c13f8718216fd86d1a38d2f5045420fe5
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, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or hosting malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful websites.

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://traffnew.ru/aws?utm_term=manualidades+f%25C3%25A1ciles+con+papel+pinocho PDF link annotation
    • https://gazafakapudon.weebly.com/uploads/1/3/4/3/134345815/tuluzigapovuferegate.pdfIn PDF document text
    • https://site-1174852.mozfiles.com/files/1174852/dark_side_lyrics_eric_church.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421641/normal_5fcc9ebe039ae.pdfIn PDF document text
    • https://wegotutitupal.weebly.com/uploads/1/3/1/4/131453182/1015386.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462379/normal_5fddad96cc8a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448343/normal_5fee77022754e.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/bunobu/865702561.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/fourier_analysis_princeton.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/communication_assistant_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/zivejolisalumumav.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/lowes_cabinet_hardware_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/63408818647.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_off0000fac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC7 5384 bytes
SHA-256: 391ee5e70fe4a58063b71462b257fb4df9aa05e48ae485cf1a4be1028b48e8d7
font_01_sfnt_off00010c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9C 11776 bytes
SHA-256: 303bf73d2873ccb16799601f84effbfc9a634d9f9dd37fdf717bd69f4e520b16

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