Malicious PDF — malware analysis report

Static analysis result for SHA-256 5407e698c38212ee…

MALICIOUS

PDF

68.4 KB Created: 2021-01-20 11:34:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 630cf366f3073a9e98c6988e71c48096 SHA-1: 916bd0ec7c9961ba3ac8bc596e210e078efa3c35 SHA-256: 5407e698c38212ee2e4165b3f88091cbea521b09d1953d5a7f820ab0bcc318fd
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 further malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/123?utm_term=isaac+newton+va+the+goi PDF link annotation
    • https://site-1171796.mozfiles.com/files/1171796/dash_box_running_boards.pdfIn PDF document text
    • https://nemerode.weebly.com/uploads/1/3/0/7/130775229/sojuwewijenakat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489422/normal_5fb2bde8218a1.pdfIn PDF document text
    • https://site-1174930.mozfiles.com/files/1174930/28238965476.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381082/normal_5fed33f858684.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414689/normal_5fca2a0ecb69a.pdfIn PDF document text
    • https://site-1178179.mozfiles.com/files/1178179/tetuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386074/normal_5fe53003be03d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366022/normal_5feb7ee85b56d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369336/normal_5ffd05db548f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496170/normal_5fec295b69624.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/fekife/ancient_egypt_powerpoint_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/windows_xp_startup_repair.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/jazipunerebivowipi.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/i_m_a_mess_lyrics.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_off0000d016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD016 5020 bytes
SHA-256: 64efd34c3b1743902d05b977e07ac4480c09646b7148c9c84eccc752c90facb1
font_01_sfnt_off0000e146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE146 10080 bytes
SHA-256: 0d09f8a933fe751bf889d192399d2455f21d8c5f39d43168e88d432b7cc7e629

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