Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab53ea56fed7ff60…

MALICIOUS

PDF

62.7 KB Created: 2020-11-24 21:12:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 445dcb5724cf57ce14930cb9a0f49efc SHA-1: 97f9c3c892dfc9e2a203c9da3e0c2cb79d9c12e7 SHA-256: ab53ea56fed7ff60e4756f42680394800475a094ac9e309efb36802c2110eec5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to direct users to other PDFs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffset.ru/strik?utm_term=thermometer+clipart+images PDF link annotation
    • https://dapevorejux.weebly.com/uploads/1/3/4/6/134695165/zojolotefuzazobek.pdfIn PDF document text
    • https://gobitinu.weebly.com/uploads/1/3/4/9/134902795/8064088.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/jedaxopopuko/59548371427.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/ados-_2_manual_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/ruxozejemalomozejupopusiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f425ca1f-e62b-4f97-8345-a0ffbc0f89e1/an_introduction_to_mechanics_kleppner.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/vokulelalapaxap.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/3d_max_interior_design_tutorial_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/23560287764.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/girerigugejobanofo.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_off0000b79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB79E 5296 bytes
SHA-256: f0bb75eb26717bacc9bd836b13ae49abe68db2669de557bc000cec7cace639e5
font_01_sfnt_off0000c975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC975 10976 bytes
SHA-256: 4925ed3a9e423f384ff2ebe154e8d42d6750321af64ad8b5fdf355b65458bcbb

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