Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8afe0ccf66160c…

MALICIOUS

PDF

71.5 KB Created: 2021-02-16 22:23:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0d87c76750e23239548524b389536713 SHA-1: 6c1e5e5834d95b2c3e79df2d957655783534f912 SHA-256: 1a8afe0ccf66160c1b40cde97132d2090a76cd2e60eae169c1e85ae47c3d85e9
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://bologen.ru/strik?utm_term=navy+eval+writer+mentorship PDF link annotation
    • http://itclick.pro/root_android_without_pc_appsii6r.pdfIn PDF document text
    • http://vuvuga.xyz/milling_dynamometerczr24.pdfIn PDF document text
    • https://cdn.sqhk.co/varaxupumami/hdjjVgd/72016367224.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467318/normal_5ffac0de6973d.pdfIn PDF document text
    • http://detonicinitalia.website/ebay_kleinanzeigen_for_germany_apkupe2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499653/normal_5ff33dfc9c749.pdfIn PDF document text
    • http://topfrag.rip/xawefekogzknrf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_601811174641e.pdfIn PDF document text
    • http://ubzvp.com/88425241050p2ulc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460241/normal_5feb1ab293d2f.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/semuxemakaw/camtasia_studio_tutorial_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/lonofadisuluvazuwenarok.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/45094669916.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_off0000dbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE3 5284 bytes
SHA-256: 2439006a846d77bea4acbd0fa9829a5ad123fee38110d38049d187238dc41f9d
font_01_sfnt_off0000edcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 10440 bytes
SHA-256: 60c8e24cd38064db471e20962f6a1d723dacd13f529014be5167a6a7113f5a89

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