Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c3164b72f42659b…

MALICIOUS

PDF

68.5 KB Created: 2020-12-01 12:44:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b61a5dd4eef281c43a6d62614b1504db SHA-1: ed256714e4e534bfe4d1c523e1977a5f5de95fdf SHA-256: 2c3164b72f42659bd83d477a848f2e7b75817a574d5b115521685821102237d1
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, forming a link farm. One of these links, https://traffking.ru/aws?utm_term=couch+sheets+paper+making, points to known malicious redirector infrastructure. The presence of numerous links and the redirection to a malicious URL strongly suggest a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffking.ru/aws?utm_term=couch+sheets+paper+making In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380680/normal_5f9650c174620.pdfIn PDF document text
    • https://sajosapisede.weebly.com/uploads/1/3/4/3/134344890/tedafibivo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc17203e2fce462bc8fc7f8/t/5fc382d89b1ed035384a3244/1606648538277/down_in_the_easy_chair.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc18b2c68612547ed62b026/t/5fc2eb91eaf37e3b64fd1cda/1606609809078/magnet_and_steel_live.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f27ea13a450babf44921/t/5fc228253c6ccf69f3a6c47e/1606559796609/vizagepidabov.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f7fbe9fc3622d5227cd2/t/5fc22a025147b148047bc5aa/1606560263110/61520159033.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f964ff8-6757-421b-8dde-59df9afeb114/38616275366.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/457f8e44-8b6a-4a44-a9fc-5e7127c4ab1c/3d_printing_presentation.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dda511f6a41984857aa8/t/5fc49aa23f75b1664366ecbf/1606720166125/the_french_revolution_study_guide_part_3_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf86e8cb11b25c09b9ff8/1606219887247/wood_stove_fan_no_electricity.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_off0000d063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD063 5284 bytes
SHA-256: 983c0555913542ef99c271b5940545c0c8228887ca7f70b299e7b7d8870902a3
font_01_sfnt_off0000e233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE233 10420 bytes
SHA-256: f5aa03700f52dadfc30ec2f5aa2791111d61875bac087af475dee4f967a9ec6e

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