Malicious PDF — malware analysis report

Static analysis result for SHA-256 aebfc3c105e83268…

MALICIOUS

PDF

64.2 KB Created: 2020-11-09 18:06:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c14d7b167a44fa061ac8dc550d9a3c43 SHA-1: 8a68ee4db3c5c8be0f4a3ad1e0ceec5c58525762 SHA-256: aebfc3c105e8326804a6abd19aa651b47864631ffbe40836f286647a4b5b1971
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF containing a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One prominent URL, 'https://trafffi.ru/123?keyword=cms+report+login+page+online', suggests a phishing or credential harvesting attempt disguised as a login page. ClamAV and ML classifiers also flagged the file as malicious, indicating it likely exploits PDF vulnerabilities or contains malicious content to achieve its objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://trafffi.ru/123?keyword=cms+report+login+page+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413838/normal_5f9b23ea7e4e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373281/normal_5f8e7f7f95649.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375080/normal_5f91e1f822ebf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415974/normal_5f9f8be44030c.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/loduluxadasivik.pdfIn PDF document text
    • https://jidamusalaf.weebly.com/uploads/1/3/4/3/134378250/zuseva-xilibagaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379611/normal_5f9a436fe2df1.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/sugaguxagu/bapogoj.pdfIn PDF document text
    • https://s3.amazonaws.com/fulomufimikim/logitech_m535_bluetooth_mouse_not_connecting_to_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/jawbone_icon_bluetooth_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/error_status_0xc000012f_bad_image.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/effortless_experience_book.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_off0000bff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF8 5044 bytes
SHA-256: 32adee9881ed50ac1e5b35ed89006e754111834dad99594e99ab5fe273b120f7
font_01_sfnt_off0000d105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD105 10388 bytes
SHA-256: 0776a574e890d21c2bd7984002205ba176d3e404447dfa5c72b6706e21b92096

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