Malicious PDF — malware analysis report

Static analysis result for SHA-256 439ad7436d7b6a85…

MALICIOUS

PDF

79.2 KB Created: 2021-03-18 10:31:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1e6f7591f4d5b43358a584251c2cf076 SHA-1: 79280dbcac6017bc9971453d275956eb9da1c19c SHA-256: 439ad7436d7b6a856cbec344f9345b35bc204456fd4f068f7ea4a189eb87ab59
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a high-severity heuristic firing for a redirector link, specifically `https://jacksth.ru/wix?keyword=line+6+spider+iv+75`, which is described as an SEO redirector for free-download phishing. The presence of embedded URLs and the overall detection suggest the document is designed to trick users into downloading further malicious content, likely for phishing.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=line+6+spider+iv+75 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451750/normal_602a400eee9b4.pdfIn PDF document text
    • https://cdn.sqhk.co/libibajuzumu/jijiage/gabuzobidajal.pdfIn PDF document text
    • https://cdn.sqhk.co/nebemina/higrLgj/67579768794.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474465/normal_60445b513cdf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373782/normal_604f1fcae8983.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/7bgjb8q/55193415708.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzevawu/btif7zX/vanokapimalitaz.pdfIn PDF document text
    • http://wutomomar.22web.org/tamujoxitixajubiminevime.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501965/normal_601eda3e7b393.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/Libjjgc/luke_bryan_country_songs_youtube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_601de139444d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485711/normal_6043cc61a4fe8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416150/normal_5fc87212da458.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476011/normal_6048417b5f146.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wavudipikudela.epizy.com/how_to_cite_online_news_article_mla_in_text.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d9e5038-5bf3-491a-a19d-fe5550534679/80963168164.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5716f345-0c7f-4804-8b83-728bf973fb2c/how_do_you_open_a_sentry_safe_with_a_dead_battery_and_no_key.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_off0000ef87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF87 5072 bytes
SHA-256: b5b464dd7ba801a7925988ceefb9e011864848c7170503202070bd3d4615fe0c
font_01_sfnt_off000100e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E9 17108 bytes
SHA-256: c15103d7292886a8eee04b2573821651e65cabd789534ec83c267f4ac813800b

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