Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5b92567c10af01…

MALICIOUS

PDF

65.0 KB Created: 2020-11-19 15:10:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ad4d7b4385c778a1e58d72aa02f3dda4 SHA-1: 8102f57329bb1b043dcd3483d5b4bdfc8120896a SHA-256: 6c5b92567c10af0141ed5e6952de429463159bc77ac2df86514b002935a5ed74
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many pointing to other PDF files, suggesting a link farm or redirection mechanism. The primary malicious URL identified is `https://traffset.ru/strik?utm_term=nc+pug+rescue`, which is likely used to host or redirect to malicious content. No scripts were extracted from this sample, but the extensive linking and the nature of the detection indicate 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
  • 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://traffset.ru/strik?utm_term=nc+pug+rescue PDF link annotation
    • https://dudikojegak.weebly.com/uploads/1/3/1/4/131406444/760068afadf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374848/normal_5fad4da5a238b.pdfIn PDF document text
    • https://xoxefalumigak.weebly.com/uploads/1/3/4/5/134527234/5287807.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/sutimesedizop.pdfIn PDF document text
    • https://wekijoborumotis.weebly.com/uploads/1/3/4/4/134484899/zujuzubedi.pdfIn PDF document text
    • https://gubuxojigez.weebly.com/uploads/1/3/4/6/134650605/d1946cfa72511.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/divikufifir/disifodasajidinunajisela.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/bunigox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a66c2723-fcd2-4971-8ebd-1ab02313d9de/lefeguzukijef.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/introduction_to_computational_mathematics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4baed8e-c21b-4a21-aca6-8b39d92489b6/vabot.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/rejume.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_off0000c2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D0 4828 bytes
SHA-256: 72b83477377c05fc2e5203374aa8eed28c74b51e1b0447b469d5285c087b5c16
font_01_sfnt_off0000d35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35C 10684 bytes
SHA-256: f02cf8bd662aa42e1e84eeb1be5ec500189606f29888e098c45aecd802dce716

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