Malicious PDF — malware analysis report

Static analysis result for SHA-256 1303dd60a082dc75…

MALICIOUS

PDF

66.0 KB Created: 2020-11-23 23:59:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d595ebc9a01b757c9f6927ed580c0d34 SHA-1: bcaa61ce559e5db9323c702c7778709732af5bcb SHA-256: 1303dd60a082dc75ee03b37aab3d3a6491303a6d0245110ca6d6f52b105b94ea
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or directing users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

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://trafficel.ru/strik?utm_term=nuka+world+power+armor PDF link annotation
    • https://sujajikozodes.weebly.com/uploads/1/3/1/3/131384638/fiwepe.pdfIn PDF document text
    • https://letitunonagafi.weebly.com/uploads/1/3/4/4/134494227/3440429.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/5913240.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/jeromopelurab/53163412923.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/923e37a3-a926-45ad-9e48-651246c4fe31/41572428461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9681d0c7-d138-48eb-95cb-64c27e9d3539/reading_explorer_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b7b8ca2-569f-4671-af5e-888f1b82c60b/68619214076.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/bollywood_movies_free_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/runavejuxuvasofonevin.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/minecraft_nether_update_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/96028211447.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/41164343488.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_off0000c6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6ED 5052 bytes
SHA-256: af5b9a37564aed8a8ce1d0bf79d6b218b474ab7f371cf595b9391760ee44215f
font_01_sfnt_off0000d820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD820 10444 bytes
SHA-256: 28814d9cfb848fac51c9682319fe0677e0127d147d53fbb73e19c0f9e3663411

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