Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf59b53fc0190d8…

MALICIOUS

PDF

73.9 KB Created: 2021-02-15 19:10:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8c165d986b17510b5030245e921a83bc SHA-1: ccf14eb932148961fcba44d8ed78e5228df48f27 SHA-256: 9cf59b53fc0190d83ad5786c5dbcd474a2e15c82cbc32d202f4735c2bdf35e68
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an external URI and an image lure that redirects to a phishing website, suggesting a phishing attack pattern. The document body, though heavily obfuscated, appears to be related to educational content, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=label+7+continents+and+5+oceans+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403274/normal_5fc5f55200cb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485587/normal_600aba9817285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368493/normal_5fd9e761a4173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369783/normal_600fffba00720.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410989/normal_5fc96077c418e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482619/normal_5fdc8892786c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453741/normal_5feb411f46317.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_6017b9cb226af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470223/normal_5fc899249491f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404725/normal_5ff3ef5360e7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459320/normal_5fca4b191025b.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/wezukep/android_binder_ipc_framework.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/48190032158.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/executive_summary_business_report_example.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/81800075366.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/pipetotes.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/93914811018.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/cnp_assurances_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/89774546350.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/jutoni.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_off0000e47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47D 5468 bytes
SHA-256: 25189891139ad57871ddfbee0dfdda231c10037ab626076a087e9e4339899754
font_01_sfnt_off0000f72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72A 10184 bytes
SHA-256: 6bfad7fa1a440d364a33d4cc9cff459f8af61c860e13e89ad066dc6e7afb6480

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