Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4bace2606b3ea52…

MALICIOUS

PDF

63.3 KB Created: 2020-11-17 14:40:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73a7cb50f685ac3d39f25e288cb5904e SHA-1: 1cda81f37f323bdc053054e329f41cd991d610af SHA-256: f4bace2606b3ea527473462018544bb3012d9b7357f8b9d8356f9b2d90091215
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV also flagged this file as malicious, indicating a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the embedded links suggests an intent to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=tmea+region+26+orchestra
    • https://cdn-cms.f-static.net/uploads/4413373/normal_5f9712872423f.pdf
    • https://cdn-cms.f-static.net/uploads/4401976/normal_5fa2566b615a0.pdf
    • https://cdn-cms.f-static.net/uploads/4413235/normal_5f96ea3ae6a5d.pdf
    • https://cdn-cms.f-static.net/uploads/4366014/normal_5f87113969427.pdf
    • https://cdn-cms.f-static.net/uploads/4375908/normal_5f8d735f1fa6e.pdf
    • https://ralawuxageg.weebly.com/uploads/1/3/4/3/134319431/0c68c.pdf
    • https://cdn-cms.f-static.net/uploads/4370285/normal_5f8f21ca2b6b8.pdf
    • https://cdn-cms.f-static.net/uploads/4419645/normal_5fa1173fc0aac.pdf
    • https://cdn-cms.f-static.net/uploads/4374984/normal_5f8f40bc69b66.pdf
    • https://cdn-cms.f-static.net/uploads/4375521/normal_5f8faf43548e1.pdf
    • https://cdn-cms.f-static.net/uploads/4458132/normal_5fa9a5b037ef3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xazarujokemus/adt_safewatch_quickconnect_plus_user_manual.pdf
    • https://uploads.strikinglycdn.com/files/0f10a3a0-dafc-40ee-a594-182b24b26a7f/centurylink_webmail_secure_login.pdf
    • https://s3.amazonaws.com/tuzakifezara/24042537868.pdf
    • https://s3.amazonaws.com/wizuluworafid/math_in_focus_grade_6_answer_key.pdf
    • https://s3.amazonaws.com/jidosatikim/vabivumonunage.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b785.bin
6e4799d5c6a39446c31158af49f47e26ea330ec06a67673203ea2f47f81ae3ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB785 5416 bytes
font_01_sfnt_off0000c9c4.bin
1fe9021c83f0f701cb983fb0f884dd8b8eddef0132e669d86f25e5a0da0790a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C4 11440 bytes

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