Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c57894b1d1b5cd…

MALICIOUS

PDF

75.2 KB Created: 2021-02-01 07:00:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7104b1e198d34a51d1cef41aec3b416e SHA-1: 7912acdea9f59b03abbf4a42cd9f893edb2ffb87 SHA-256: a7c57894b1d1b5cd77a4277981778928bd5d2c7008a15e01ccb4e9295b882c2f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing software. The presence of numerous external links, including one pointing to 'seumenha.ru', suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and heuristics point towards a social engineering attack leveraging a fake installation prompt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://seumenha.ru/123?utm_term=install+chrome+os+on+pc PDF link annotation
    • https://wisowoturap.weebly.com/uploads/1/3/1/4/131453432/noxunopum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482618/normal_5fd0e4271ee40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494669/normal_5ffa831737825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414851/normal_5fe9064143bab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391319/normal_5feeb2558d2a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478947/normal_5fedad11477a8.pdfIn PDF document text
    • http://dragonflysagewellness.com/gufezavosamunafeko8rfh1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423430/normal_5ff250d97d03b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386606/normal_5ff431a6ca7cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470692/normal_60001f9a2a0de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380395/normal_5fd05d30eceaa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496005/normal_5fca12381f2c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493221/normal_601738c4a0745.pdfIn PDF document text
    • https://gokokunebede.weebly.com/uploads/1/3/0/8/130874183/jokevu_puzabiwimebuxov.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/239f38af.pdfIn PDF document text
    • https://dawurawo.weebly.com/uploads/1/3/5/3/135323901/wonela-zogirakexixuk-jodajumes-wexesaru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476434/normal_5fcd3fd9b6578.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379720/normal_60088aa96cb77.pdfIn PDF document text
    • http://nasporte1.fun/los_gallinazos_sin_plumas_libroz7l1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390371/normal_5feb645a45cd4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446774/normal_60060febdb6c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366316/normal_6010d050f0425.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 5112 bytes
SHA-256: f9723d73638bf4c562d955b6bb61d426b5d708f5078a833ce69d419f459783fb
font_01_sfnt_off0000fa23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA23 10800 bytes
SHA-256: 5b61198775cadddbce343fdda9f8f3c5321aa435f3a6a638589d155c89ae24a4

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