Malicious PDF — malware analysis report

Static analysis result for SHA-256 025f4f6cf95567e4…

MALICIOUS

PDF

66.8 KB Created: 2021-02-14 18:58:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 5babb50373dd88220761d8871776faa0 SHA-1: f892537a211015a9ee58102befb62d2c4abbb637 SHA-256: 025f4f6cf95567e47f87f70f9486f4cc3afdb388ed0811da04aa0017916ce9b5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, including one to 'jacksth.ru', suggesting a link farm or redirection mechanism. The PDF's structure and embedded links point towards an attempt to drive traffic to malicious websites, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://jacksth.ru/wix?keyword=greek+decoder+cc-54+answers PDF link annotation
    • https://cdn.sqhk.co/sajatanugeg/ieLVFg8/54327727409.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384469/normal_5fcf94c05eb3a.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/jogjie8/tepigiperuv.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/gegi6F5/wusepog.pdfIn PDF document text
    • https://cdn.sqhk.co/xonafelog/8rhdieb/cross_road_crash_adelaide.pdfIn PDF document text
    • https://varemajog.weebly.com/uploads/1/3/4/5/134585454/mabepaw-deguteduz-lubetimusixanaj.pdfIn PDF document text
    • https://cdn.sqhk.co/kupulifip/U53KfjB/didi_gregorius_yankees_trade.pdfIn PDF document text
    • https://gulawunobuxag.weebly.com/uploads/1/3/4/6/134627092/pazipevatizeren.pdfIn PDF document text
    • https://cdn.sqhk.co/lilomovetum/jhjiajj/falling_puzzle_free_download.pdfIn PDF document text
    • http://lojasamericanasbr.com/star_stable_free_star_rider_accountposv7.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/giFdiir/27326576057.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/ggdXYja/milofasogimovasug.pdfIn PDF document text
    • https://xomikevogonenoj.weebly.com/uploads/1/3/4/7/134743799/nupijat.pdfIn PDF document text
    • https://cdn.sqhk.co/nesorosuxim/jehjigN/6511673836.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E1 5332 bytes
SHA-256: bb164b673428a50e66eb6f641bca96839dfb2a67113da741f516beee3807894f
font_01_sfnt_off0000dc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3D 9888 bytes
SHA-256: b52944c621ba8f53bcc004024cce372efb1ba2bde7134c13e5800cf078326251

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