Malicious PDF — malware analysis report

Static analysis result for SHA-256 edff30fe75bc7ca9…

MALICIOUS

PDF

71.3 KB Created: 2021-02-28 00:36:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5458e34a09bade41283e8842241b006b SHA-1: b4a70792c7ea5e3ff4d3a9c12cae10dfd69d84c1 SHA-256: edff30fe75bc7ca97f0ade31450817c919837c03f6dc0c562fa5ca77e91b85c4
244 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous embedded URLs that redirect to external sites. The primary purpose appears to be directing users to potentially malicious or phishing content, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/wix?keyword=algebra+2+august+2016+regents+answers+jmap In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372967/normal_6015d32a2f472.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/46734532110.pdfIn PDF document text
    • https://zeziruxowajud.weebly.com/uploads/1/3/4/6/134698921/kikonarufowir-buvireza-ruxopodiwuwutu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412377/normal_5fe8123f41abb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446399/normal_600eea407769a.pdfIn PDF document text
    • https://cdn.sqhk.co/rawewosit/KIfOdhf/mijuxinikomovimara.pdfIn PDF document text
    • https://sebuvijanamo.weebly.com/uploads/1/3/4/8/134856810/7934463.pdfIn PDF document text
    • https://vanizubifimid.weebly.com/uploads/1/3/0/8/130874516/bc4dd26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379043/normal_5fdee4720d2bf.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/ponimop_gikuxumisifoz_samidegatog_rapubasunobotu.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/senilopomu.pdfIn PDF document text
    • http://zodatowafe.getenjoyment.net/jojelopel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_6031ae880167b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426828/normal_5ffdc320bd06e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452398/normal_5feb8aae104d8.pdfIn PDF document text
    • https://xevujudibibabus.weebly.com/uploads/1/3/4/5/134599482/lipefemumojurefudup.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_off0000d901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD901 5916 bytes
SHA-256: 6551ae00b8253c6764b361f038298757e04d0a06e034dc4f3dc06f93b0d553ff
font_01_sfnt_off0000ed25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED25 10328 bytes
SHA-256: 092f1249022e83edd5f0e677afec2cf37d8591fa0e5c92a22fdf69d4982444e8

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