Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd0acb57b936c2e…

MALICIOUS

PDF

76.6 KB Created: 2021-02-20 04:27:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1c24ec829778a1d22779e376e43bf694 SHA-1: a9b4ea8281196e94cfcc1fa440bdc98144349e29 SHA-256: cfd0acb57b936c2e78b9c40773630d0f8e4a65e51225d726688386d914c684c0
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded links that redirect to a suspicious URL, identified as a malicious redirector. The document body, though heavily obfuscated, contains text fragments related to a 'Dell xps 8300 desktop', suggesting a lure to trick users into clicking the malicious link. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

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
  • 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.
  • 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.
  • 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/strik?utm_term=dell+xps+8300+desktop In PDF document text
    • https://cdn.sqhk.co/veleviziwew/Gjdevgd/lilivewoduwug.pdfIn PDF document text
    • https://cdn.sqhk.co/nanijamu/bjeggih/pixel_piracy_pc_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/jjtRvif/the_tiger_king_cast_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424666/normal_603035f6c7d00.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/fS6jhjh/freeze_experian_credit_freeze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/76517454044.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/38070571250.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/99235293431.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/lasarej.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/42003449318.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/samarubedekigeg.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/kiruguduvuwozajosuf.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/squarespace_tutorial_template.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/centreport_wellington_ownership.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/zotegirigokow.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/cross_platform_games_pc.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

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDC 5276 bytes
SHA-256: f92ee8392b542da3c6c019fb9a8a28ada5d21c0365061cb932afb88730160098
font_01_sfnt_off000100f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F3 10824 bytes
SHA-256: f600357ec3762c852c87c3c58a37f37cb9d10d39539c07b110e6eabaec17064c

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