Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e8998c7a0d2fec…

MALICIOUS

PDF

75.8 KB Created: 2021-03-17 03:57:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6d8b32fdeb52779b5e62b7f635b06017 SHA-1: 2b1e94469b06ea8f3bd0c9eb37ed486c2caec2c0 SHA-256: f1e8998c7a0d2fec6dbf02f8ebf41e1bc39286da85b89f52b082aff936427bf3
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a high-severity heuristic firing for a redirector link, specifically identified as an image lure for phishing. The embedded URL leads to a suspicious domain, suggesting a phishing attempt to lure users into downloading malicious content or providing sensitive information. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

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://dugedepap.ru/wix?keyword=human+blood+cell+typing+pdf+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384825/normal_604e31a6d2f29.pdfIn PDF document text
    • https://cdn.sqhk.co/pulizojiwim/oqKBjac/sumerian_cuneiform.pdfIn PDF document text
    • https://cdn.sqhk.co/zedugixaka/bihhaja/33511538325.pdfIn PDF document text
    • https://cdn.sqhk.co/tejikeluz/pGih0gf/tujukazapu.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/closjdV/19768909543.pdfIn PDF document text
    • https://cdn.sqhk.co/mokevesin/fPRijha/92442365564.pdfIn PDF document text
    • https://cdn.sqhk.co/xorakulenido/pfEC7Uy/pababatasu.pdfIn PDF document text
    • https://cdn.sqhk.co/pajerelo/Qhchh8k/gibudanidif.pdfIn PDF document text
    • https://cdn.sqhk.co/fifotadog/7khgZYc/bioplastia_lowell_tem_formol.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/KhbMicq/7628333693.pdfIn PDF document text
    • https://cdn.sqhk.co/vedasukuki/s7ejahd/rofofosav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454167/normal_5fe140346a4b7.pdfIn PDF document text
    • http://vopugixeroramox.medianewsonline.com/academic_word_list_cambridge.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/danizejatege.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/xukonakefules/41757820193.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/ruwiramafop.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/vimebutefeju.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/icloud_for_windows_all.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_off0000ea63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 5768 bytes
SHA-256: 51b7f440dde1bde8d3b9b461104b7b5740374665ca3b2b5ebbe630d3374e7c77
font_01_sfnt_off0000fe05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE05 10376 bytes
SHA-256: 63575a599fe0ff32bd19b8f4e4166d9f113c991d237dd003233170db7debe577

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