Malicious PDF — malware analysis report

Static analysis result for SHA-256 72fc85d1215c6487…

MALICIOUS

PDF

77.6 KB Created: 2021-03-23 20:15:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2deeb88a4cc6d1f3a26f50aab1b952e9 SHA-1: 20b2557326fcf88890f8e7482186f6a0747e3909 SHA-256: 72fc85d1215c6487d902083fc3faadb1dadee1b9d262016b6fd9ff2e1aef85d2
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. The 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristic suggests the document is designed as a phishing lure, using a seemingly relevant search term to entice downloads. The embedded URL points to a suspicious domain, likely serving as a redirector to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/strik?utm_term=mercruiser+3.0+engine+block+drain+plug PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496014/normal_601c9857b1c3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467926/normal_5fe5354fcee06.pdfIn PDF document text
    • http://vawagizipul.iblogger.org/what_year_was_the_first_russian_revolution.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476939/normal_6002751972c01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460266/normal_603255634772e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497395/normal_604d19285e55b.pdfIn PDF document text
    • http://genonobamubus.22web.org/57788928437.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wekolukore.epizy.com/30445326978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a05972d-58d0-4a22-9596-245a2773236d/juditumudojanabuve.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/gothic_word_search_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/45451870635.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/38813699677.pdfIn PDF document text
    • http://kepikinol.epizy.com/arreglos_de_objetos_en_java.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/thirsty_crow_story_in.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/79649523191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1b192d5-989e-48ad-88bd-064be597949e/luvatigizepaganozo.pdfIn PDF document text
    • http://kamegil.epizy.com/catalogo_de_cuentas_contables_completo.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzakob/mixubikaseri.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/16183378709.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/27264555400.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/android_emulator_mac_bluetooth.pdfIn PDF document text
    • http://mabazekow.epizy.com/38596454203.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/kixugozewewewowojefevo.pdfIn PDF document text
    • http://divepirat.epizy.com/where_can_you_drop_off_clothes_for_donation.pdfIn PDF document text
    • http://kitojob.epizy.com/3720089845.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_off0000f0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 5788 bytes
SHA-256: 648ed8693c1ebe2f9b5d71fff75228affc468908a33de052d6ac60bf57295701
font_01_sfnt_off000104c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C6 10592 bytes
SHA-256: ae7f53d381c6c36a8791890093067796778a28c8ee59b962d7d8b125768b58a1

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