Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3dc081971a68834…

MALICIOUS

PDF

82.9 KB Created: 2021-04-04 03:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 161dffc1fb3655630e6c5220eb524237 SHA-1: d1526ead55193428139b2676e4f02c6103b9913e SHA-256: b3dc081971a68834200508f4dd815b748e834e2387113fe62eb48c6863024fb0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are obfuscated or lead to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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
  • 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://golowaki.ru/award?keyword=builtwithscience+pdf+workout+b
    • https://cdn.sqhk.co/rokabumake/gw6z9hj/44224582028.pdf
    • https://wutekeli.weebly.com/uploads/1/3/1/3/131379380/sadami_sonogimuvos.pdf
    • https://cdn.sqhk.co/moromasi/gfOjihi/carminho_e_pablo_alboran_perdoname.pdf
    • https://fimosezit.weebly.com/uploads/1/3/0/7/130775491/fugofizi_warup_fugabudel_zowelutugika.pdf
    • https://vavepinabuma.weebly.com/uploads/1/3/5/3/135303395/dukanukiz.pdf
    • https://tewawizibix.weebly.com/uploads/1/3/5/3/135347661/lutimevujesafijaref.pdf
    • https://rozujefugupag.weebly.com/uploads/1/3/4/0/134017035/demozuge.pdf
    • https://darifojiwuz.weebly.com/uploads/1/3/4/5/134588766/b9d6e28a.pdf
    • https://pobonagodin.weebly.com/uploads/1/3/4/7/134756685/gomofifijepowur.pdf
    • https://zavetogodafewer.weebly.com/uploads/1/3/4/7/134709275/3889055.pdf
    • https://xadiditenir.weebly.com/uploads/1/3/4/7/134763486/gawugimakatutimilob.pdf
    • https://tugewenexi.weebly.com/uploads/1/3/1/3/131381976/5e50b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_98d5456781dd441cbe32318ef4e9b726.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c809c44e-672f-4193-9d59-1d196686ae3f/bruice_organic_chemistry_solutions_manual.pdf
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_02b662cddd0547c3843f3bab37c97211.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b209e588-aedf-4da3-9979-75de0497bd58/38443933102.pdf
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_727d595d5fcf4d408186c55ac797ff46.pdf?index=true
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_6917d2ee16ea4a1fb3f1199c7142bf31.pdf?index=true
    • https://206c1dc7-391c-4b20-ac64-b63c97020fd4.filesusr.com/ugd/87773f_7eb183e7815a495e8953afe6c4ccbe6b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6a50deb7-2cc2-45a2-bca4-287f7b4ebbf7/45932776082.pdf
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_679492954b9d4ff19c37a63f08a85b32.pdf?index=true
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_e908b56b65404611a1797a1e7a3b23ca.pdf?index=true
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_c271f95fa6d14a6abd4da7a974c1b215.pdf?index=true
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_15d150dfcd674244b9e783313737e9bd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/74462f8d-9f96-4d62-9b84-2558c6f14dfd/25392192312.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8da.bin
d76334819963731a5755052689e2d560eed32e69806a0a43d9918bb9a380e186		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DA 5260 bytes
font_01_sfnt_off00010abb.bin
3928d360a7977591fd655f84adfe995b5aafd19a2a1c63506f3854270ea964cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABB 10864 bytes
font_02_sfnt_off0001300c.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1300C 4324 bytes

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