Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff621b368ae1b397…

MALICIOUS

PDF

505.9 KB Created: 2021-04-25 23:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 54143bcdc3734d15bb05da1d867598c0 SHA-1: a14c708364d65689b78c5b19be73d20e5a2f6a7d SHA-256: ff621b368ae1b39795be6789eff88ce8b40c6de986fbd0708630ff281d8d7ba7
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, and ClamAV detection confirms its malicious nature. The document body, though heavily obfuscated, suggests a lure related to a book title, likely intended to trick users into visiting the malicious URL for phishing or to download a secondary payload. No scripts were extracted, but the presence of external URIs and the ML classifier's high confidence indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8826

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://resalured.ru/strik?utm_term=silence+of+the+lambs+book PDF link annotation
    • https://cdn.sqhk.co/gijimexuv/U0jjXjf/lebikipotuwa.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/adjetivos_posesivos_ejercicios_en_ingles.pdfIn PDF document text
    • https://zelogevoge.weebly.com/uploads/1/3/1/4/131483318/vagobuxigaxajal.pdfIn PDF document text
    • http://mevixonur.mywebcommunity.org/biology_textbook_class_10.pdfIn PDF document text
    • https://cdn.sqhk.co/dedejosewor/m4girjh/wheels_on_the_bus_lyrics_melanie_martinez_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/bjb37ge/cycle_route_tracker.pdfIn PDF document text
    • http://vizoxusajozigu.iblogger.org/rivodabusep.pdfIn PDF document text
    • https://nawawedivoxoni.weebly.com/uploads/1/3/4/7/134719505/2032521.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mewarur.rf.gd/america_s_got_talent_winner_2017_performance.pdfIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_8d66aa01e9b04731a0c06a8d751a9f9a.pdf?index=trueIn PDF document text
    • http://wedinuvudazoxo.rf.gd/the_bullet_journal_method_ryder_carroll_download.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/zoxivitufevaxefajas.pdfIn PDF document text
    • http://jumepenitujox.atwebpages.com/math_algebra_questions_and_answers.pdfIn PDF document text
    • http://rigamijuzekup.rf.gd/64039419426.pdfIn PDF document text
    • https://52431b39-7396-4b0c-bcaf-ab72d449a1bf.filesusr.com/ugd/f8cef3_a08debe82ed44e93befb2ba08f570c2b.pdf?index=trueIn PDF document text
    • http://kibeboxonu.rf.gd/athens_metro_map.pdfIn PDF document text
    • https://e5720c39-3c1c-4a52-9be9-509675281b5a.filesusr.com/ugd/0010c8_e3ec066638e541bbbbd2ce682b7a0600.pdf?index=trueIn PDF document text
    • http://xedavabawavela.onlinewebshop.net/ncert_accountancy_book_class_12.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_off00079cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79CF0 5332 bytes
SHA-256: 6d17fe29616c7c833d8fb235e4bb6fe50d496dd93cd38a5cf3f29f677b82ffa9
font_01_sfnt_off0007aef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AEF4 12020 bytes
SHA-256: 8b233827b0d51638a16b55c93cf9421e67e068840577c3698ef6cee27783c955

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