Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f497894b7cf998d…

MALICIOUS

PDF

70.0 KB Created: 2021-01-23 00:58:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a3fce6af0967662fd92125d7f18542e4 SHA-1: 57172903f9b7b8bbbcd05bce79c8a93ee0eac52c SHA-256: 4f497894b7cf998d511eb83f8d5b1fbc4d9645808329ed1cba623ce2b52c0315
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link to 'https://yafferge.ru/wb?keyword=sequin%20simulator%20gamestop'. This suggests the document is designed to lure users to a malicious site, likely for phishing or to download further malware. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of embedded URLs and the redirector link are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://yafferge.ru/wb?keyword=sequin%20simulator%20gamestop In PDF document text
    • https://cdn.sqhk.co/dutebevon/HtYpjdy/utopia_season_2_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379841/normal_60094efd73a03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444100/normal_5fcdaac53b297.pdfIn PDF document text
    • https://cdn.sqhk.co/sadetujadufi/gf6Hjhm/.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417029/normal_5fda56ed1b139.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453333/normal_5fefb62dc5ad3.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/idggjiH/business_plan_freelancer_example.pdfIn PDF document text
    • https://cdn.sqhk.co/jebumujo/ixgfhjc/tejivinamevoravarok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386363/normal_5ffd2fe2963f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501980/normal_5fcb231a5a72a.pdfIn PDF document text
    • https://cdn.sqhk.co/ronofumito/gfjchdN/jididimelapamipipigazezo.pdfIn PDF document text
    • https://cdn.sqhk.co/jabuvilir/Boljcib/lufawexubisegofidil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452863/normal_5ff12054992eb.pdfIn PDF document text
    • https://cdn.sqhk.co/wanevakaxuma/d4heJih/34740270574.pdfIn PDF document text
    • https://cdn.sqhk.co/jesuzedavoti/EQ2ghgo/buck_hill_racing_team.pdfIn PDF document text
    • https://cdn.sqhk.co/papusabefo/hchcggh/82723210016.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477886/normal_6003b2220fb59.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_off0000d0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B7 5368 bytes
SHA-256: 5b4f2705e9aad90331246af06b6d153bf4c71cd0b7f138f512502fe4b92c791a
font_01_sfnt_off0000e2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E3 12492 bytes
SHA-256: 0f208a82dbe30c5e1c87e2f9815cd9ed2f7652cc2e67a94eec390cd6b69d690b

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