Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23ec54f5b9cc64f…

MALICIOUS

PDF

75.8 KB Created: 2021-04-15 12:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3644bc89ffe72085eaef2757f053daff SHA-1: f6d8f7eaccb69e827a4bc73c8a3883e1432c4a77 SHA-256: b23ec54f5b9cc64fbb617fb23b12e66a4d5dfe2a412800918459db0e8360c078
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is a common tactic for distributing malware or conducting phishing attacks. The document body, though heavily obfuscated, suggests a lure related to 'leaf structure worksheet'. No scripts were extracted from this sample, but the presence of external URIs and the malware detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=leaf+structure+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478716/normal_5fea3336f3832.pdfIn PDF document text
    • https://cdn.sqhk.co/xogatijixe/fiahj8e/godejo.pdfIn PDF document text
    • https://cdn.sqhk.co/bopelara/e6ibdRi/hot_rod_garage_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/bemaxopig/Vhejj0a/candy_jump_game_v2_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492918/normal_6057c8fd6c10b.pdfIn PDF document text
    • https://cdn.sqhk.co/titukopano/dygevid/worship_songs_guitar_chords_easy.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/jcSNqje/rilosuka.pdfIn PDF document text
    • https://cdn.sqhk.co/nemuvefik/MjcQgda/82276493081.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480744/normal_6050190968047.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457011/normal_5fc5b5fe9284b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458826/normal_5fc9e8df10900.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482020/normal_5fca89096dc35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478127/normal_5fc5cb2ed53a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368265/normal_5fe52e16d3922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458621/normal_604cd14a7e090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381756/normal_6046b80a2e826.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406481/normal_5ffabf341f77e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493597/normal_5fef99b947896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409801/normal_605d6b0dbf573.pdfIn PDF document text
    • https://cdn.sqhk.co/lomekojop/e0s4hcz/nuruzogizewepijowi.pdfIn PDF document text
    • https://cdn.sqhk.co/bunigenozav/jcsheia/86209202554.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f8ec934-82b5-4f04-a3e6-6addcc0df201/snapper_lawn_mower_parts_ireland.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0ded4ba-274f-414c-be32-a2af02181798/do_you_have_to_read_humphrey_books_in_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf59628a-100b-4a48-bb0a-837dbb611d13/vutegomijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92aea133-1861-43f3-b309-eb29ee5c9641/numoledanezikat.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_off0000ec91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC91 5036 bytes
SHA-256: c1bd05f127f9eae20c88d431b69eefb16ef79907aa5b809c37d9881cf6084bfd
font_01_sfnt_off0000fdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCC 10632 bytes
SHA-256: 4195cfd6d45dc801e143cf6c0e606bbceee9d668951e8e851afba2cb1726a89b

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