Malicious PDF — malware analysis report

Static analysis result for SHA-256 280a426c7732e2eb…

MALICIOUS

PDF

72.1 KB Created: 2021-02-18 23:52:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 57a10b6b76a001a7f9addab81ef18a15 SHA-1: 9480838a5803c74241a29f8d4a1d13a5a5098263 SHA-256: 280a426c7732e2eb9a1c1dabad754e4ffe16206c346f5b51aaccdc9d3afb9029
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous embedded links, with at least one identified as a redirector to known malicious infrastructure. The document body, though heavily obfuscated, appears to contain metadata related to 'Nfr 2015 live stream 2020' and was generated by wkhtmltopdf, suggesting a lure for users interested in such content. The primary attack pattern involves directing users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/wix?keyword=nfr+2015+live+stream+2020 In PDF document text
    • https://pejagefetem.weebly.com/uploads/1/3/0/8/130815482/3441183.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/bjhst3k/gujozoposujapi.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/mhaB7id/underhanded_business_tactics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485927/normal_601452a4c27a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369509/normal_5fdf46b26b150.pdfIn PDF document text
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/6af04d2c88024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444636/normal_5fd9d00c6832c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487432/normal_601889a5688da.pdfIn PDF document text
    • https://jefiwoso.weebly.com/uploads/1/3/5/9/135996081/45f84ea7528.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449965/normal_5fdf2c2e2c893.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384836/normal_6007e8f49e930.pdfIn PDF document text
    • https://cdn.sqhk.co/jekurona/jfUcha4/f_stop_media_gallery_pro_apk_free.pdfIn PDF document text
    • https://ramageputa.weebly.com/uploads/1/3/1/6/131637054/fusugodudixin.pdfIn PDF document text
    • https://cdn.sqhk.co/karapenakozi/hf6lgia/87373396224.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425768/normal_5fc852d850b5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448713/normal_6011e35e990b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462730/normal_5ff758b8240b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zenuvivasefum.epizy.com/yasuo_build_guide_solo_top.pdfIn PDF document text
    • http://xutenodopo.rf.gd/92955590884.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_off0000dd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0C 5392 bytes
SHA-256: 75c2335391c2c7bb40af959b21b9733452e551b24b84c35cb433c95ce392dd65
font_01_sfnt_off0000ef66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF66 10440 bytes
SHA-256: 68b165c2d527d191b3df7d308dcc9fd42a7e1254c963df53eccdc278697d70ce

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