Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1cafd3d5ca5f7a…

MALICIOUS

PDF

70.9 KB Created: 2020-11-17 22:05:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7365061d0e6ebd07d0608a6f21581fec SHA-1: eef25656fc216f45f910cc05b736a95548778ff6 SHA-256: cb1cafd3d5ca5f7ad306a9327c084f0f161b6319a0be229ffeab77399f5f6363
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The embedded URL, 'https://traffine.ru/123?utm_term=engineering+student+resume+objective+examples', is flagged as malicious. The ML classifier and ClamAV detection strongly support the malicious nature of this file. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://traffine.ru/123?utm_term=engineering+student+resume+objective+examples In PDF document text
    • https://wavigijaburejuw.weebly.com/uploads/1/3/4/5/134588531/wekana-ropaxi-bewasoti-modij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5f9acf0382e6d.pdfIn PDF document text
    • https://rejipunedeze.weebly.com/uploads/1/3/4/6/134652096/00bc12a24b6328.pdfIn PDF document text
    • https://ginefudev.weebly.com/uploads/1/3/4/4/134454890/dodexolanekunem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_5f9a7dee9cb91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368485/normal_5f87c354a8015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376382/normal_5fa397b2ac7e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379846/normal_5f8b5680c6365.pdfIn PDF document text
    • https://dapujevubo.weebly.com/uploads/1/3/1/4/131438680/favipasavubazuligeru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cea27cb-a7e7-43d8-8b4c-b0c70445983c/23519034374.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/021196d6-8e54-47f1-a9f9-d782cc9c7ee0/izim_dersleri_perspektif.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/cat_mario_free_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/81362987510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3da1b17f-e2d5-4f54-881b-abf6bad81ac5/sacrosanct_vampires_of_skyrim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31f7c511-d581-4c70-9c23-f5436ddbb770/65938697813.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_off0000d705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD705 5692 bytes
SHA-256: 0e668c25b54a9d31ca13f888da176d3ed6938f1450da4774215feb35e45b9687
font_01_sfnt_off0000ea5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5E 10636 bytes
SHA-256: 4fc1950236bc11df04dffc5bbedbd0dd1e264108eab81077a2a2ec2b778d868d

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