Malicious PDF — malware analysis report

Static analysis result for SHA-256 7331f85abbc04c76…

MALICIOUS

PDF

62.1 KB Created: 2021-01-14 17:26:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e34749931f8a8b6261725d96cf757c44 SHA-1: 82563bcf9dc1c520af8fdf0af72a810f88c81656 SHA-256: 7331f85abbc04c76b67e3e4da4b3364102e5ad8e68215ef30cbaa8164ba6c305
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external link farm, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection strongly suggest malicious intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/123?utm_term=yeti+blue+microphone+user+manual In PDF document text
    • https://cdn.sqhk.co/zozijawutuxu/fhdKMV5/abyssrium_world_tap_tap_fish_release_date.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368953/normal_5fad8d0e1d614.pdfIn PDF document text
    • https://wesodopudo.weebly.com/uploads/1/3/4/2/134234684/04c1eeb686a3e56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373757/normal_5f89111992ab8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387815/normal_5fe3418c1bec8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450355/normal_5febfc12ae5d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414852/normal_5fccaaa88cd30.pdfIn PDF document text
    • https://site-1175916.mozfiles.com/files/1175916/mobile_top_up_promotion.pdfIn PDF document text
    • https://site-1177862.mozfiles.com/files/1177862/what_colour_tube_for_cbc.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/fodose/telulodepeliwimikideb.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/kopaleludewaze.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/45768718955.pdfIn PDF document text
    • https://s3.amazonaws.com/suzitivasekoga/rurijatataj.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_off0000b73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73B 5272 bytes
SHA-256: 1165af843cc744d9f5e8d543150b1cb7c9225945dde30d8f710c8bb12a311979
font_01_sfnt_off0000c8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F9 10128 bytes
SHA-256: 5e9417536d9d725870e26f134fa9b0986fb0976503345a3caf0afb59222ec025

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