Malicious PDF — malware analysis report

Static analysis result for SHA-256 f46cfd9ed76812a0…

MALICIOUS

PDF

80.8 KB Created: 2021-02-08 08:46:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: bca91ce467b6a53a164a9859e10e8d3c SHA-1: 5749292430b4ea84d239efd9d5c9c90abf5bf3fa SHA-256: f46cfd9ed76812a0992e67911c760b85391efb81b7a1adf561fdbd7c377b734e
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'Jcb backhoe parts manual', suggesting a targeted phishing attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/aws?utm_term=jcb+backhoe+parts+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481272/normal_600f7aa334bff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373508/normal_6009dbbab9cf7.pdfIn PDF document text
    • http://afracheat8.xyz/java_swing_login_form_javatpoint6xea1.pdfIn PDF document text
    • http://belplitka.ru/calendar_template_2019_uki0dtz.pdfIn PDF document text
    • http://gsmall.space/miwifibas4sh0x.pdfIn PDF document text
    • http://nominasacra.ru/96240389260kubiu.pdfIn PDF document text
    • http://cozyplacefor.rest/m_4_sherman_tank8gcop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492240/normal_5ffe5b5ed0cf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405414/normal_60152db5ea9fe.pdfIn PDF document text
    • http://lnstagram-blue-ticks.com/kijazumopezutefixin120f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404739/normal_600d5c498ce55.pdfIn PDF document text
    • http://www-sfr-fr-monespace.com/mon_orthographe_illustrhac2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389097/normal_601150f3ce263.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495691/normal_5fefff8310ec9.pdfIn PDF document text
    • http://instapriz365.site/siwijemakagopinomat75e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xejefexevopu.epizy.com/adblock_for_mac_chrome.pdfIn PDF document text
    • http://jedalavupu.epizy.com/dls_2020_mod_apk_data_obb.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_off0000f7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C7 5368 bytes
SHA-256: 7e7b1a5ee28b1bc84a207cc1b99593a206d93604bad449fe3748d92b0ed8e0c9
font_01_sfnt_off000109df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DF 16304 bytes
SHA-256: 96954abd0626641fb2d46caacbf608e24ead73842906e01027af9b043c2af1b5

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