Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bdd1751cffea863…

MALICIOUS

PDF

65.0 KB Created: 2021-01-12 11:09:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4ba24d8b73f5e04e205ae566d6974be4 SHA-1: 1fb38091fa5554de28f4e5289909371188751eb6 SHA-256: 6bdd1751cffea8630a8a802f15ca7dd4ac554a9f92bc85f0e73f86bf31cdeabc
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagging it as a redirector link and a link farm on disposable hosting. The embedded URLs, such as 'https://gettraff.ru/123?utm_term=mt+ayr+schools', are likely used to direct users to phishing sites or download further malicious content. No scripts were extracted, but the primary attack vector appears to be the extensive use of malicious links within the document.

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
  • 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 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://gettraff.ru/123?utm_term=mt+ayr+schools In PDF document text
    • https://static.s123-cdn-static.com/uploads/4387241/normal_5fca5b463a743.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/IREjfaM/56064205780.pdfIn PDF document text
    • https://fetedujas.weebly.com/uploads/1/3/0/7/130776810/98964b4cc09.pdfIn PDF document text
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/4900675.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403274/normal_5fc5f4e74f6d3.pdfIn PDF document text
    • https://xemakoxen.weebly.com/uploads/1/3/4/3/134320116/2474061.pdfIn PDF document text
    • https://manuxemewawi.weebly.com/uploads/1/3/4/4/134443751/2079667.pdfIn PDF document text
    • https://rofikilidoxomuk.weebly.com/uploads/1/3/4/0/134017179/b250cc3478a54c8.pdfIn PDF document text
    • https://susetizumuru.weebly.com/uploads/1/3/4/4/134461935/1511178.pdfIn PDF document text
    • https://viwezoluzuwa.weebly.com/uploads/1/3/4/4/134401695/542a23f431300.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/9OlZOjj/37838630503.pdfIn PDF document text
    • https://taretowixulu.weebly.com/uploads/1/3/1/0/131070971/831339d916a70a.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/zazelujeju/casio_baby_g_shock_manual_5338.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/payment_process_request_template_in_r12.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_off0000c0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FF 4992 bytes
SHA-256: e393a87dec3e4c7e863e38d4eaca07a80b131b096ad3ec4e71e981a5f895f46a
font_01_sfnt_off0000d202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD202 10544 bytes
SHA-256: 708c0d2533007212bb271bf1cb29dbf8788c45eea163bd81877893731daec625

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