Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb972a552aba545…

MALICIOUS

PDF

73.7 KB Created: 2021-03-03 15:43:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c81444f2dae2381d997ee8165525583a SHA-1: 782c39acab6916ba2ec9464872535643296a97c5 SHA-256: deb972a552aba545a5a4de3a75f5791fd81c60043985eb52000500e40b0320fb
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a tactic to manipulate search engine results or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or redirection campaign.

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://midufefew.ru/123?utm_term=brothers+sing+on+pdf PDF link annotation
    • https://dozogifelezu.weebly.com/uploads/1/3/4/3/134313369/7950899.pdfIn PDF document text
    • http://ch-redirect.icu/29194627008kd26j.pdfIn PDF document text
    • http://axecheat9.xyz/dinodidefojawujasxktaq.pdfIn PDF document text
    • https://rozuguki.weebly.com/uploads/1/3/0/7/130775318/bifupixif_gewini_kajuruvebaruri_fadinifapoluju.pdfIn PDF document text
    • http://fherixq.com/534183474686qmmj.pdfIn PDF document text
    • https://fenogelojana.weebly.com/uploads/1/3/4/9/134904444/9113263.pdfIn PDF document text
    • https://xupukowipor.weebly.com/uploads/1/3/5/3/135304830/wuduxupobejedetapu.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/vinivuxo/gta_vice_city_apk_aptoide.pdfIn PDF document text
    • http://gixopesibesuges.epizy.com/lixefe.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/panasonic_viera_plasma_42_remote_code.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/22725656362.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/97362175393.pdfIn PDF document text
    • http://jukasiwatan.epizy.com/gimezefekagemol.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/kerbal_space_program_control_surfaces_inverted.pdfIn PDF document text
    • http://waxasaxer.epizy.com/bowinuzupafudobore.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/free_apache_web_server_for_ubuntu.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_off0000e53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53C 5108 bytes
SHA-256: e6b0a9552f9409a1eeb141d713d0f0782b50718bfa47e1bcf04cef79e4e6fc54
font_01_sfnt_off0000f6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A0 10184 bytes
SHA-256: 841a7054b36a1bb4973082a22a06df12cc9c4271890a771ecd99a0671f809778

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