Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b72c840f9af3059…

MALICIOUS

PDF

67.3 KB Created: 2020-11-29 08:41:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 82656dfac3355aa9619fa2429b9caf18 SHA-1: 77986b7fb1ae46849be4f9906a92f5616b905025 SHA-256: 7b72c840f9af3059b728643769342ce56d19b805d0f574cabbde42ce1e0d3fa0
214 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, including a known malicious redirector at `traffine.ru`. The document body, though heavily obfuscated, appears to reference 'Skype free for windows', suggesting a lure to trick users into visiting malicious sites for fake software downloads. The presence of multiple PDF links and a critical ClamAV detection indicates a phishing or malware distribution attempt.

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://traffine.ru/aws?utm_term=skype+7.+40+free++for+windows In PDF document text
    • https://xasuvakem.weebly.com/uploads/1/3/4/4/134400919/9414570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443342/normal_5f9c6ab4a9069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385612/normal_5fa04b2cbf60f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380854/normal_5f9ade041c062.pdfIn PDF document text
    • https://ralerafuzirepob.weebly.com/uploads/1/3/4/3/134386916/zupogogodegorixebola.pdfIn PDF document text
    • https://jaketomerinojox.weebly.com/uploads/1/3/4/1/134109184/b61b82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484609/normal_5fb61486470fd.pdfIn PDF document text
    • https://bujupovira.weebly.com/uploads/1/3/4/4/134472582/vuxala-rukopek-ralifuri-xofonijelalem.pdfIn PDF document text
    • https://bokakarepexopo.weebly.com/uploads/1/3/4/7/134750167/f0af8cb74.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/fasanag/45375322082.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/nafoxekezufigevapa.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/widebimunomuru.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/16259267778.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_off0000c957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC957 5496 bytes
SHA-256: b41486c11e271453ebf1d3249abef741b75c11b1e01d707b9a548577eaf7450d
font_01_sfnt_off0000dc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 10388 bytes
SHA-256: ee0179968397aa15b3f51449b475ad4808b22c6052162454f0ee82d44d3407fa

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