Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d559ca75dc161c…

MALICIOUS

PDF

80.9 KB Created: 2021-02-27 21:25:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 72d66d1dac232d42e7ccd5f6e67df3d8 SHA-1: 21b5e05c4986a2b8139014b3ff4f09f35d48c807 SHA-256: a9d559ca75dc161cc4e7fff26450cb8a9e0cca45d68fa8bc1c8e3800039e0006
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a heuristic firing for a redirector link, specifically identified as a 'free-download phishing' lure. The embedded URL, https://mezovuduw.ru/123?utm_term=how+much+do+long+haired+miniature+dachshunds+cost, is the primary indicator of this malicious activity. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF, classifying it as a phishing trojan.

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://mezovuduw.ru/123?utm_term=how+much+do+long+haired+miniature+dachshunds+cost PDF link annotation
    • https://cdn.sqhk.co/kerodamajop/Sugcja5/super_sonic_gif_unleashed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495551/normal_60319bb559797.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462732/normal_5ffdb710a9229.pdfIn PDF document text
    • https://cdn.sqhk.co/tedigedubemi/RGjibHx/86525053617.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491450/normal_601d806edebfe.pdfIn PDF document text
    • http://wititabeg.22web.org/lemek.pdfIn PDF document text
    • https://cdn.sqhk.co/jimavidozeze/6jdiiO0/turbo_racer_3d_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zogosugo.onlinewebshop.net/vefagutuwometuveputaxavaz.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/38874732789.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/dilokor.pdfIn PDF document text
    • http://suludowoseti.epizy.com/61394067096.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/platos_republic_summary_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/artemisa_planta_medicinal.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/tanojotaxow.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_off0000fddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDF 5408 bytes
SHA-256: 921993e5cb11eedfcdad474edcb673e75f23e7dda1401cd37f05d153833924ee
font_01_sfnt_off00011023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11023 11284 bytes
SHA-256: b56c03af64f9ad5ffdcaf1a82ce627bd242146b938a95633759897bfcdb5925d

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