Malicious PDF — malware analysis report

Static analysis result for SHA-256 853525017e5da096…

MALICIOUS

PDF

65.7 KB Created: 2020-11-22 16:00:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e8e33f64a2350745c606cc9c29cb8013 SHA-1: 1481604d827837cc71ac61d7c9eff71ebd5a7ca3 SHA-256: 853525017e5da096bb0581d6b67ab467b1106b4957bed9717450061e8fabc29a
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to redirector infrastructure or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The presence of a link to 'ggtraff.ru' with a 'utm_term' parameter suggests a sophisticated redirection scheme. ClamAV and ML classifiers also flagged this document as malicious, supporting the assessment of a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/aws?utm_term=the+arcana+mod+apk+ios In PDF document text
    • https://vowegokemawo.weebly.com/uploads/1/3/4/3/134353822/87c9de093.pdfIn PDF document text
    • https://zorusijumabek.weebly.com/uploads/1/3/4/8/134851431/wupobeloger.pdfIn PDF document text
    • https://bafonalilazuxi.weebly.com/uploads/1/3/4/7/134731076/7cdc6.pdfIn PDF document text
    • https://jarofuzaduse.weebly.com/uploads/1/3/4/5/134502270/3609745.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365576/normal_5fa2eb5213f64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380859/normal_5fb2bc9363b46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472506/normal_5fa629c5d1a4d.pdfIn PDF document text
    • https://gujojiri.weebly.com/uploads/1/3/4/4/134434224/8135857.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/muvunekagok/50593990384.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/crossword_quiz_answers_animals_level_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c80952b-990a-44ef-8ea2-64619cb115d0/95570327791.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8610b59-37b6-446c-9fd7-7b1ccc6839f3/strategic_safari_summary_ppt.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_off0000c5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E7 5292 bytes
SHA-256: 8952ec515b5ada3db32479b9c3979793139c77ac2483e47967c5f84f5a586c30
font_01_sfnt_off0000d7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B8 10272 bytes
SHA-256: b446eaeb016ba382404a44258a7a86b22237f3595830a507a0e6133d7fa20e17

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