Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5134eb133cb18f…

MALICIOUS

PDF

73.3 KB Created: 2021-03-23 15:36:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9ed3f9aba48a2460c88edac1b3e7a8f SHA-1: 7fb0786409c9699c6849c6b4c2289b1080c963f9 SHA-256: cf5134eb133cb18ff28c3c143a8a10f2e652a20b9cde6a8e94ec43273f6b6382
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body is heavily obfuscated, but the presence of external URIs suggests an attempt to download further malicious content or redirect the user to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=uag+scope+reviews
    • http://nugawijuxuv.mywebcommunity.org/organic_chemistry_books_for_msc.pdf
    • https://cdn-cms.f-static.net/uploads/4369164/normal_60558342bfbfd.pdf
    • https://cdn-cms.f-static.net/uploads/4409393/normal_5fd1c40fe938a.pdf
    • http://xanusojuruxu.sportsontheweb.net/seismic_isolation_for_earthquake_resistant_structures.pdf
    • https://cdn-cms.f-static.net/uploads/4469370/normal_60230170529aa.pdf
    • http://sejerodetupumil.medianewsonline.com/sejulotuwekob.pdf
    • http://wedasuf.getenjoyment.net/critical_thinking_activities_for_higher_education.pdf
    • http://wuroguredogir.getenjoyment.net/95672033482.pdf
    • https://cdn-cms.f-static.net/uploads/4367621/normal_6023f9ba69e33.pdf
    • https://cdn-cms.f-static.net/uploads/4370278/normal_60245b5c8271f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ca45e500-f59e-4584-b09e-99804875cfec/how_to_use_fagor_rapid_express_pressure_cooker.pdf
    • http://xakazasaravi.onlinewebshop.net/employment_confirmation_letter_template.pdf
    • http://fazaburifug.myartsonline.com/icdas_caries_classification.pdf
    • https://uploads.strikinglycdn.com/files/ed06045a-4f31-46ad-9ef2-30ec5183af05/vosujizevewegulem.pdf
    • https://uploads.strikinglycdn.com/files/63e2e1f4-6fc3-4baa-ad88-783ea37e9c2e/boy_scout_cooking_merit_badge_book.pdf
    • http://nibubatovavav.atwebpages.com/arabic_words_in_english.pdf
    • http://naburonip.myartsonline.com/business_letter_writing_book.pdf
    • http://jinugiwi.atwebpages.com/connected_speech_examples.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de46.bin
9cccca15f3890529a91651faa1dae58c203ea57aadfe4d59c2c4aa3086d0edd9
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE46 5212 bytes
font_01_sfnt_off0000f02f.bin
f2ac3448ac31568c46c41de6e9177486937250a3b715632f6974fa9a9b5b6916
pdf-font-stream PDF embedded font (sfnt) at offset 0xF02F 11780 bytes