Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d6ebb0a5e3b4f1…

MALICIOUS

PDF

77.7 KB Created: 2021-02-25 02:27:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 1c044d5391ff038e43d0c317012e9c93 SHA-1: 4e90f46958de1180a0d88b0ec47eaec256e609d7 SHA-256: 16d6ebb0a5e3b4f19542faedc754d93990362fea7edf66580d51a68ee03935d6
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/award?keyword=super+mario+bros+2+walkthrough+3ds'. This URL is also flagged as an SEO UTM redirector, suggesting a phishing lure. The ML classifier and ClamAV detection further support the malicious nature of this PDF. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

Heuristics 4

  • 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.
  • 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/award?keyword=super+mario+bros+2+walkthrough+3ds In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380523/normal_5fd1a41578864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467036/normal_6013a2e053b85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457305/normal_5fc8c828a7a1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412894/normal_5fee48fc4256a.pdfIn PDF document text
    • http://naworigexoz.iblogger.org/jusulutotudusuxitebudubo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370989/normal_5fd08923b1be6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416796/normal_5ff0880328b33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458124/normal_600bcbd3785ad.pdfIn PDF document text
    • https://cdn.sqhk.co/lobaluxomo/ajhgegf/preschool_lesson_plan_themes_for_january.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453550/normal_5ff69d19784c9.pdfIn PDF document text
    • http://potobol.22web.org/70918634660.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/LgeigQD/alien_shooter_2_the_legend.pdfIn PDF document text
    • https://cdn.sqhk.co/kikutajaz/idrhgAe/vadarudurelemekubije.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384028/normal_5ffcdbbc15ef6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/dekogamik/50137197812.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/ntnu_master_thesis_latex_template.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/imf_country_report_bosnia_and_herzegovina.pdfIn PDF document text
    • http://jidowadosul.epizy.com/54285565419.pdfIn PDF document text
    • http://wexugemo.epizy.com/623721990.pdfIn PDF document text
    • http://fudapigoxuwumu.rf.gd/aararum_kaanathe_song_free.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 4384 bytes
SHA-256: 7ed10d07f8170e755949833ad121982cf238b342b13cf9d9d40442b3a602c951
font_01_sfnt_off0000ef2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 6068 bytes
SHA-256: 35f84d74a0a3494d8421ea5ce117c8989362962ed337a81c51ece0ebb86c8d3c
font_02_sfnt_off0001039a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039A 7904 bytes
SHA-256: 4d229a44d97324444fb7b765b354dcd1c4880a113bfd3eeffc3f42252446a06c
font_03_sfnt_off00011964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11964 10460 bytes
SHA-256: f9b86e6064b7ab6444b1b85ebf83541a2927faab058945e2536e63f479d0da48

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