Malicious PDF — malware analysis report

Static analysis result for SHA-256 53beddabb458f3fe…

MALICIOUS

PDF

69.9 KB Created: 2021-01-17 09:31:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4f6fffde6bcde2f380c1af95a96dd8fb SHA-1: 8da7335e5caa25f9aaeddfb709059a79641c9c66 SHA-256: 53beddabb458f3fef80ef030142b48a019758dd13795eb9ad3e5fd2d1c0ce1ba
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or scam attempt. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of external URIs and the overall structure point towards a phishing lure, likely disguised as legitimate content to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://traffset.ru/wb?keyword=nike%20run%20club%20apple%20watch%20app%20not%20syncing PDF link annotation
    • https://site-1173509.mozfiles.com/files/1173509/dora_and_friends_into_the_city_nick_jr.pdfIn PDF document text
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/cd6fdf.pdfIn PDF document text
    • https://cdn.sqhk.co/pevejotomoma/jf4hgja/amazon_kindle_paperwhite_7th_generation_release_date.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370057/normal_5fbeb8257c2e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367305/normal_5f92117c429c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367308/normal_5ff2f8b694127.pdfIn PDF document text
    • https://site-1244719.mozfiles.com/files/1244719/hpcsa_general_ethical_guidelines.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384468/normal_5fe107665b154.pdfIn PDF document text
    • https://site-1177680.mozfiles.com/files/1177680/strategic_management_concepts_frank_rothaermel_4th_ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_5f8804eb4ce60.pdfIn PDF document text
    • https://site-1168507.mozfiles.com/files/1168507/27883479518.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_off0000d4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F1 5564 bytes
SHA-256: 0d16eba6c13ed9296aa009c4d3dd815e82b84ec5a72752d0ba1e784dc13aca37
font_01_sfnt_off0000e7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 10236 bytes
SHA-256: 1e565d15146de1aa77c2140595e698bfcaa101aad892505e582fcb064225a5d6

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