Malicious PDF — malware analysis report

Static analysis result for SHA-256 110ea8599e6a8330…

MALICIOUS

PDF

77.6 KB Created: 2020-12-22 22:16:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5433f78fbdd4f5d03e97a0551aa6a8df SHA-1: 349f679915b7aef2889bfa57888c018a69a2e0b2 SHA-256: 110ea8599e6a833078fdb12d20ab8cf140e16f615d79f474b0e66981da6cd541
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffking.ru/123?utm_term=l-lysine+for+acne+reviews
    • https://wetarotener.weebly.com/uploads/1/3/0/8/130813606/porusokajurox-dalugowegafokax-xawivasigedaxub.pdf
    • https://kixasakuzejud.weebly.com/uploads/1/3/5/3/135347884/6106042.pdf
    • https://xazapadikud.weebly.com/uploads/1/3/1/8/131871762/1844859.pdf
    • https://nuvusutapisi.weebly.com/uploads/1/3/4/4/134460305/5474046.pdf
    • https://wumefabifu.weebly.com/uploads/1/3/4/8/134888429/kediwa_gexusanila_dalobimazin_bunudipu.pdf
    • https://guvoladedesu.weebly.com/uploads/1/3/1/4/131453897/fizuter-dupogomixifom.pdf
    • https://lopamazaveseku.weebly.com/uploads/1/3/4/6/134643240/6025677.pdf
    • https://mexarufuwusa.weebly.com/uploads/1/3/4/5/134599415/vovevasasozalam.pdf
    • https://jojimixumomural.weebly.com/uploads/1/3/4/4/134438106/8206908.pdf
    • https://fomezesas.weebly.com/uploads/1/3/4/3/134343882/2d09361ccc.pdf
    • https://losepubi.weebly.com/uploads/1/3/4/5/134502138/213210.pdf
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f8fa88583732.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wovitiku/81534009657.pdf
    • https://uploads.strikinglycdn.com/files/e30cd826-7965-4927-b64f-e49c07dde5cc/mewojuweb.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0c4.bin
8ab49d989065c9886de35ff497fd880248cc29be513b9188d9f0ffcb5d154a33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C4 4808 bytes
font_01_sfnt_off0000e137.bin
fcf63cccdd7037d808295db8cbd9d89e1ff39846829af7b5f6d26ce5f9ea0d73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE137 10524 bytes
font_02_sfnt_off00010566.bin
bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10566 16312 bytes
font_03_sfnt_off00011af1.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF1 4324 bytes

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