Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecaf1e82e3a7ced4…

MALICIOUS

PDF

67.2 KB Created: 2020-11-23 13:28:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 0846a589269deeccb72f7b00a0cfa735 SHA-1: dba795b9a2b0955b92b6d16018d4137c0b746698 SHA-256: ecaf1e82e3a7ced4f5352ab47291d46bb1f4988412de8fb3968ad02982484031
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain, identified by heuristics as an external URI and flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to a book club discussion, aiming to trick the user into visiting the malicious link. The presence of embedded URLs and the overall detection by multiple security tools strongly suggest a phishing or malware distribution attempt.

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://trafffe.ru/strik?utm_term=who+moved+my+cheese+book+club+discussion+questions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366005/normal_5f8af046bb42f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369930/normal_5f88de6696b18.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/18604078815.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/friend_like_me_song_id.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/texniccenter_beamer_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/46542110641.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/29560771225.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/besadamamexuvabivulipo.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/fluke_77_iv_multimeter_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/jajofawojigibakokor.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/kipp_washington_heights_middle_school.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/ap_biology_oxidative_phosphorylation_pogil_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/city_of_san_diego_standard_drawings.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/gaxujopo.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_off0000cb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB99 5376 bytes
SHA-256: 215a966a8d115dd647bee6b97ec523e18785e5273e38959f88c44c859e436181
font_01_sfnt_off0000ddd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD2 9900 bytes
SHA-256: 5498fcab1d2705f7622fb524ea86857a48db299f8d7040f13d8f32f789f4c227

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