Malicious PDF — malware analysis report

Static analysis result for SHA-256 77452a11eed43ba1…

MALICIOUS

PDF

65.0 KB Created: 2021-02-21 07:02:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 0945bfc51bddb47c126647c96db1c4c0 SHA-1: 0aa071282bb6beb102deb82411a309102681f4c7 SHA-256: 77452a11eed43ba16634e671932398edb9800a5f14fcbf3de8c0fd4c41447848
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/wb?keyword=king%20of%20my%20heart%20tempo%20bpm'. This indicates the document's primary purpose is to lure the user to this malicious site. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of a malicious URL within the document body suggests an attempt to deliver a secondary payload or phish for credentials.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/wb?keyword=king%20of%20my%20heart%20tempo%20bpm In PDF document text
    • http://salearea.pro/dopixewugiselajotukanapuj87c.pdfIn PDF document text
    • https://cdn.sqhk.co/guxuboru/jjgdtMX/nupunavil.pdfIn PDF document text
    • http://lazezubeb.22web.org/vivah_video_song.pdfIn PDF document text
    • http://jezojarugeboz.22web.org/batched_and_bottled.pdfIn PDF document text
    • http://extrameets.fun/sikiru_ayinde_barrister_songs_freeqb62m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pusuzuxagog.rf.gd/how_to_cook_chicken_breast_in_a_pressure_cooker_xl.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/apa_bibliography_format_indent.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/zudosamubigogegubazewixoj.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/84288134012.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/rulabakukukowexagukavudi.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/79138453877.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/tusaguf.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/vagozipenaxoximuwef.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/maritime_english_volume_2_answers.pdfIn PDF document text
    • http://segidamilezuv.epizy.com/ketakubesip.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/gekomovujegu.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/52161256980.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_off0000c0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A8 5316 bytes
SHA-256: 7b71ba121e2f123b0af233654ec6b1a2abb5db7eca5df08e964e991bb3b68f09
font_01_sfnt_off0000d2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A6 10648 bytes
SHA-256: a369040b5601174cc710f0487cfeb85bdd23b26cbfebb889d11672d787721988

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