Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de13001dcbc19b8…

MALICIOUS

PDF

67.1 KB Created: 2021-02-19 02:59:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 58eb3afd78adc5c4fe5ad96dfe24a14e SHA-1: d38c37a5b19eaae6ceeb9809f40e8b31ae4a8f06 SHA-256: 4de13001dcbc19b87b76ca7a6a3e9bbf39e1f5270f16253e081d4f32614be6bd
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high-severity heuristic indicating it's an SEO redirector link, likely for phishing or malware distribution. The primary malicious URL identified is https://jacksth.ru/aws?utm_term=baby+trend+sit+and+stand+shopper. While no scripts were extracted, the PDF structure and URL suggest an attempt to lure the user to a compromised or malicious site.

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://jacksth.ru/aws?utm_term=baby+trend+sit+and+stand+shopper PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381976/normal_5ffbdd9493321.pdfIn PDF document text
    • http://loxokunetuladi.66ghz.com/mejerobudipukexa.pdfIn PDF document text
    • https://cdn.sqhk.co/fizuborugas/jdjfWn8/russian_propaganda_posters_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/subilikiwi/aidclij/67915986779.pdfIn PDF document text
    • https://cdn.sqhk.co/pafatewodoju/aTGcfDF/21238202195.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/ihjgjtm/vitamin_b12_benefits_for_men.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378607/normal_5ffc6fdf2a0f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402252/normal_5fdd380ebd475.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366309/normal_5ffc2c2a17fd5.pdfIn PDF document text
    • https://cdn.sqhk.co/duvapegoleva/7taPxjb/selolof.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/jivuxo/maths_integers_worksheets_for_grade_6.pdfIn PDF document text
    • http://mezexefobotero.epizy.com/kujak.pdfIn PDF document text
    • http://pawekixezad.epizy.com/19311137885.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/tatuzowileseneposuruwiri.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/57265330485.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/dipexewado.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/zygote_body_free_italiano.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_off0000c747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC747 5308 bytes
SHA-256: 9498683f4d38ed7ea8fdc114340d2259b3125d0be59c3244a0f03514a17f80e6
font_01_sfnt_off0000d947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD947 11284 bytes
SHA-256: 272cf516dc0273ab4a7bb63dcf3190110425871962bce43b206ae0650dfea4f4

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