Malicious PDF — malware analysis report

Static analysis result for SHA-256 15669023397f2d0b…

MALICIOUS

PDF

226.4 KB Created: 2021-05-01 16:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 86c79da0fc85874718861e8d6d660dde SHA-1: 26ab1e564e80c99096868a2c419a7c6e2fce49aa SHA-256: 15669023397f2d0bce1176b3ee539230023ce3e2fec0cbd3cb85e9abf6d8cd5d
144 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to a malicious URL. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URL, https://resalured.ru/strik?utm_term=osprey+publishing+free+books+week+3, is the primary indicator of compromise, likely leading to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://resalured.ru/strik?utm_term=osprey+publishing+free+books+week+3 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490917/normal_60040f00a6ca0.pdfIn PDF document text
    • https://nipukidifa.weebly.com/uploads/1/3/0/8/130873732/vupadiga-nuwukumofekemag-xasafonibibep.pdfIn PDF document text
    • http://tukomibewi.getenjoyment.net/bewasirudofivase.pdfIn PDF document text
    • https://gulurevipad.weebly.com/uploads/1/3/5/3/135349864/8825954.pdfIn PDF document text
    • https://ripegedabezigiz.weebly.com/uploads/1/3/2/6/132695689/990ca8417663df.pdfIn PDF document text
    • https://wezobugedelu.weebly.com/uploads/1/3/1/8/131856743/mafamep.pdfIn PDF document text
    • http://bexixibeguben.sportsontheweb.net/best_story_to_learn_english.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388428/normal_60463d65d4192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476123/normal_606e61179498f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nezugetojuf.myartsonline.com/bepuxokawozafuwezeluvonot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/741ef0e7-8cd6-4c86-b902-815f76d48fe3/kemupupixibisitijaf.pdfIn PDF document text
    • http://tuxodubikanirod.atwebpages.com/ciclo_biologico_trypanosoma_cruzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9af42e3-6ee1-4560-81cf-8ca0e573d338/teromijexolegigigefakol.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/walking_alone_at_night_in_the_city.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/libonetovofozolevotaraf.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/nevififufejebarika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2ba9bf5-c208-403c-a909-7dea7aefb0b7/lubesepobevixinogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be8a13ce-0ebf-4720-bf09-02c7febf8311/54532042740.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cae8f539-8832-4e05-8781-6202cade93b7/phrasal_verb_in_spanish.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_off00034250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34250 5544 bytes
SHA-256: f3f38bb52fb99ab1e12a132805559f5eda1bf5ce2ac57274e31349aed686d8b0
font_01_sfnt_off00035542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35542 11132 bytes
SHA-256: b1721606fdfb724453ec3b52e3eecc44d8dad42074f9f975ec9edb205645f926

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