Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a932d40c75c331…

MALICIOUS

PDF

68.0 KB Created: 2020-12-31 07:02:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1d485edaf89c346ec3edfbd76523389a SHA-1: 713feafc23ace88ffc3a665e4ba77bcf543b9237 SHA-256: f7a932d40c75c331035b827666c72f89e5fd3a495889d549151ae7139b3414a5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://traffnew.ru/strik?utm_term=car+sound+effects+ringtone', suggests a lure related to car sound effects. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/strik?utm_term=car+sound+effects+ringtone PDF link annotation
    • https://rewazifepa.weebly.com/uploads/1/3/4/6/134664269/57442b495d156ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5fa3c07f1a32c.pdfIn PDF document text
    • https://xoregofejaba.weebly.com/uploads/1/3/4/6/134651656/pusavu_puvepizibazoxe_rukexuredo_gidunabifipupi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_5f87b75448a56.pdfIn PDF document text
    • https://cdn.sqhk.co/busosuwik/UhcwJOv/ufo_enemy_unknown_wikia.pdfIn PDF document text
    • https://cdn.sqhk.co/wemonamo/faPJahh/23029137963.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/zinudipir/87722061519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14c15e5d-3ebd-41e9-9f0c-7548759e0ca8/fijekilemalenagilafu.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/gulajasizumuvoxozum.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/aventuras_workbook_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/66942821271.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/statistical_analysis_of_geological_data.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff865579-66d6-461f-ac5d-d3e8ffad6aee/line_dancing_ballito.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/free_unblocked_proxy_sites_online.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/65416271850.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/phaser_3020_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/canada_citizenship_guide_2018.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_off0000cec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC6 5064 bytes
SHA-256: cd57f7d1e67f82b633f3f5501790bed654a7d6b02bc6cd96c5baa1adf4f95b8f
font_01_sfnt_off0000e00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00E 10308 bytes
SHA-256: 36ba27a3429be103d1e5695a1ef22a5eb62c8941c239d45174cbccbb61760074

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