Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4a37d14a07fd67…

MALICIOUS

PDF

63.1 KB Created: 2020-11-25 19:14:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 50eb59958f7c334c87fb011e9ea8a8f8 SHA-1: 0024248dbe6b7641d7039ab475f7415197eee794 SHA-256: cb4a37d14a07fd67c880555f8b7b4150c44c26879eb2959dcbd4fbc393d68bcc
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a link to a known malicious redirector, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though partially corrupted, suggests a lure related to 'Mountain valley 2 apkpure'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

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://gettraff.ru/strik?utm_term=mountain+valley+2+apkpure In PDF document text
    • https://nisutezobeta.weebly.com/uploads/1/3/4/4/134486685/detofesemawemami.pdfIn PDF document text
    • https://gobumireg.weebly.com/uploads/1/3/1/3/131383916/a48b0b15e6.pdfIn PDF document text
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/07de6afbe.pdfIn PDF document text
    • https://niliwuwez.weebly.com/uploads/1/3/4/2/134265541/6647499.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/lolaritemukole/51733968631.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/53533846785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daf7867c-dd28-4b3d-ae74-ea26c80c676a/arithmetic_density_vs_physiological_density.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0103eedf-9abc-4e50-bbee-f15a504bf942/steal_the_diamond_stickman_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/wepeliniru/3.2_unit_conversion_homework_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/the_jungle_book_mowglis_story_vhs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ca720d0-fd6d-4939-8ea0-c2e98801ddd9/66365936273.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/57555203217.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/worobiduxamej.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_off0000bbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB8 5000 bytes
SHA-256: 035bf103242e37262504b6f3c2f5db02feb0a9e537e673b40f5cc798743b186c
font_01_sfnt_off0000cce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE9 10708 bytes
SHA-256: 1947640c2e6caf4138c107b6277bae741e86cedf01049aaf451370475e2be9f5

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