Malicious PDF — malware analysis report

Static analysis result for SHA-256 75910ad3fa8b7162…

MALICIOUS

PDF

60.2 KB Created: 2020-12-20 10:37:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 43754859e43f7f611bd73c2810881b4b SHA-1: b619ef7e80e02e9dcd80c3b5afafa8fad9b380d9 SHA-256: 75910ad3fa8b7162f8a6fab67fce657e9b772e3d2c7607bf76a55dbf9048dcd1
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. It contains a large number of embedded links, many pointing to external PDFs, suggesting a link farm or a method to obscure malicious destinations. The ML classifier and ClamAV also strongly indicate malicious intent. The primary attack pattern involves directing users to potentially harmful URLs, likely for phishing or malware distribution.

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://cctraff.ru/aws?utm_term=risk+management+guidelines+for+insurance+companies In PDF document text
    • https://tojetipa.weebly.com/uploads/1/3/4/2/134234581/7307861.pdfIn PDF document text
    • https://dorikorojuj.weebly.com/uploads/1/3/3/9/133987202/kuditolodobame-pujonomigoxujab.pdfIn PDF document text
    • https://nodararikerat.weebly.com/uploads/1/3/4/8/134885074/46f7400cd51.pdfIn PDF document text
    • https://judurufag.weebly.com/uploads/1/3/4/6/134688768/loxaxe-narowebi-lajokusewa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451045/normal_5fd92ebf9e7ec.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/mamibis/20436130198.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5184e1c8c7413144d0b9f/t/5fc82b9443b29e7a5aeac15e/1606953878602/detention_movie_2019_watch_online.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/75138559079.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/33645877602.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/6356331662.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/osrs_evil_dave_rfd_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/95585863711.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_off0000af2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2C 5544 bytes
SHA-256: 270e6b8ccd4e833b19a61c9564cf8360b8a75fe6ec572c3a6737b6f4906ca27c
font_01_sfnt_off0000c200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC200 9872 bytes
SHA-256: 8a34d12e95c30b6d8549c4c026a1d1301243890d3d4b54622aa3bdff2ca3ba37

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