Malicious PDF — malware analysis report

Static analysis result for SHA-256 528f0b9345aaf586…

MALICIOUS

PDF

65.6 KB Created: 2020-12-27 08:02:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e8085d6aef87a9fa188479ab5b28af84 SHA-1: 3f764113f7748fb411edc3a976ae4b72ed07d329 SHA-256: 528f0b9345aaf58696fbd121f07f9e8b208702bd0a696391c0961b530d98cf8f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan payload. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful websites.

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://trafftec.ru/strik?utm_term=k+word+wallpaper+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421061/normal_5fc433dd563b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480414/normal_5fc456e0cf76a.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/OWlydja/motorcycle_racing_gear_shifter.pdfIn PDF document text
    • https://bafonalilazuxi.weebly.com/uploads/1/3/4/7/134731076/tarim.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/welibokatem-lomurujimejixu.pdfIn PDF document text
    • https://cdn.sqhk.co/sebudesusoj/sjc5IFI/5037964217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367013/normal_5f970c960236d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403948/normal_5f9d6426000f1.pdfIn PDF document text
    • https://bepupoxusiboma.weebly.com/uploads/1/3/4/8/134847186/6303607.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425912/normal_5fa4816242956.pdfIn PDF document text
    • https://bezebaterizijir.weebly.com/uploads/1/3/1/3/131384714/tizetobepadodi.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/sazomo/watoza.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/runescape_ectoplasmator_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/argentina_visa_application_form_new_delhi.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_off0000c4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C8 4916 bytes
SHA-256: 060b51ddeb89925703c34b6d5398a17100cea68ec9060f7139fd92f2a7e20bcd
font_01_sfnt_off0000d5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A6 10508 bytes
SHA-256: 7906b13c2aa8e855566e7d9c1f526973ea3c6719dc4162e0fcabdb8a2dce8c1e

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