Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5ec3a5c4679d14…

MALICIOUS

PDF

68.3 KB Created: 2021-01-08 06:04:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f61e5542b439cdcd0af0b74777e2595a SHA-1: 10f05437edd3cddc39e1869a1c08a9e7162561a2 SHA-256: 5a5ec3a5c4679d14bfcd5dd609fa9e9e42bb73ed7fbd6365c092b866eac95944
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded links that point to known malicious redirectors and a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing lure designed to redirect users to malicious sites.

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 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://gettraff.ru/123?utm_term=common+cause+analysis+wiki In PDF document text
    • https://static.s123-cdn-static.com/uploads/4482872/normal_5ff547075ffc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379485/normal_5fd0ed6a95cab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372085/normal_5f8bd7a0737ed.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/bemevo.pdfIn PDF document text
    • https://limofagis.weebly.com/uploads/1/3/4/6/134640762/mobibatenavub.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/ropuba/gonevejesozepesoroput.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bca95da-61cf-4d43-929c-591b35a75aaa/95286449357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/837d501d-2040-4f6e-b83e-916d278b3a85/7186064182.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/audio_song_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/emotional_and_behavioral_disorders_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/scottsdale_weather_report_tasmania.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_off0000d4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CB 5012 bytes
SHA-256: 0353c029a7daa7c3a0c618ec088459978aac92c864cd1aae4f294645f08b38b4
font_01_sfnt_off0000e5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DD 9044 bytes
SHA-256: dc3c6d3bc00d5977014864f3576fd21951197c5bfcc8b1d2329ba7effa3748a9

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