Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4d0f274e1dab45…

MALICIOUS

PDF

73.6 KB Created: 2021-02-19 08:44:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e6e2da7b485717f997998f62653377db SHA-1: c6d7cb7c834a80846d364bf34a73383e09d98db1 SHA-256: 9c4d0f274e1dab4587d39ec1a4f84de4b9a78bbb4f6fb133faa19e0d863c63de
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. The document body, though heavily obfuscated, contains a URL that appears to be a lure for downloading a PDF, likely containing further malicious content or redirecting to a phishing site. The presence of embedded URLs and the nature of the ClamAV detection strongly suggest a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/aws?utm_term=thermodynamics+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389084/normal_602d02ab0e547.pdfIn PDF document text
    • http://businesslinecenter.com/60944061935i2eqw.pdfIn PDF document text
    • https://cdn.sqhk.co/dipopoji/dV0P3jb/sojebifudidil.pdfIn PDF document text
    • https://cdn.sqhk.co/vovusupa/YmfSmek/74290432807.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420250/normal_601aa19fe74de.pdfIn PDF document text
    • https://cdn.sqhk.co/kipafipigifi/jalhdsW/jelly_filled_cookies_walmart.pdfIn PDF document text
    • http://testvvd.xyz/74094898170wtn2t.pdfIn PDF document text
    • https://cdn.sqhk.co/vujejanar/vBjdidE/code_map_escape_game_prison_fortnite.pdfIn PDF document text
    • https://cdn.sqhk.co/rapenikidu/g4axgdy/runonizimaguditede.pdfIn PDF document text
    • https://cdn.sqhk.co/numiwuzuwix/cWpDFsI/police_gun_sound_ringtone_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530323/normal_5fdd25237f99b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kugezukakig.rf.gd/any_video_converter_online_free.pdfIn PDF document text
    • http://defipezisezujor.rf.gd/german_imperative_form_kommen.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F6 5324 bytes
SHA-256: 001262d0471669227bd83a59873ba9289f256e0dbf6d62d866eb10133308d147
font_01_sfnt_off0000e8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E3 10060 bytes
SHA-256: dc4bc0b9d45942a85d5c6f6d901394b267606cedb27e6dae4eb62faec85eef25
font_02_sfnt_off00010b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B20 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176