Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb046307e1c6fc6…

MALICIOUS

PDF

81.8 KB Created: 2020-12-15 00:36:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9d1ba047fd2e0dbd79b678ffe5e565a0 SHA-1: 1864ecfa0fd76c616f4c9f66166777d356171fff SHA-256: 8cb046307e1c6fc65a7011c77bb69ee5b9e32ca4e6bba4b16c00b88ad435394e
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffking.ru/123?utm_term=night+surf+stephen+king+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403540/normal_5fac5bcd81904.pdfIn PDF document text
    • https://fitisasituwag.weebly.com/uploads/1/3/4/8/134846324/borivirowuj_kukin_sajewob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447914/normal_5fcb5e5a48d6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392470/normal_5fb8dbca70feb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413982/normal_5fbb22a030f66.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sajatofubote/espresso_android_interview_questions.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d6092e537a05ef08bc6e/t/5fcc181fc836a917f9fb1923/1607211040623/mevalewa.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/cat_ninja_over_9000_games.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/taobao_world_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/zuwodafapibonarakito.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0da75085bf90c0efcd65a/t/5fc146d93485235c86f5d578/1606502106532/todemugekawak.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 4868 bytes
SHA-256: 3d498021d9f968a9ef0187b46aab2bd6d7769ebe0392a376bb90ee0a9294dd37
font_01_sfnt_off00010953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10953 10316 bytes
SHA-256: 02fd30930449c2d903c4bda82b2d3f5a7bfc6b9d699eb699eeb23d65831fd630
font_02_sfnt_off00012c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C66 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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