Malicious PDF — malware analysis report

Static analysis result for SHA-256 83020ccd33dbb044…

MALICIOUS

PDF

95.6 KB Created: 2021-03-29 21:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15b084810f131a0c9c50b7d600f4d9c2 SHA-1: 7ebb53575acd3785dadfcb1254ce02cf3214a6f3 SHA-256: 83020ccd33dbb0441e62a3c3a829aa0a5fef4e6a1367bf2fab4f069494c1ee85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains external URIs and a callback phishing lure, suggesting an attempt to trick the user into calling a fraudulent number. The presence of embedded URLs and the nature of the heuristics point towards a phishing attack, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://botokaw.ru/wix?keyword=cybertext+managerial+accounting+answers
    • http://tajeromodovo.66ghz.com/bay_dardi_drama_ost_audio.pdf
    • http://wikowezenitezo.medianewsonline.com/auditoria_interna_e_externa_funes_e_diferenas.pdf
    • http://logekolumo.22web.org/32374628738.pdf
    • http://gutibefatidag.medianewsonline.com/budolopizu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fexajorijoworas.epizy.com/64811420830.pdf
    • https://uploads.strikinglycdn.com/files/ae82dcb8-5232-4234-ab23-311f93f1a1c4/zuzokobij.pdf
    • http://batareguso.epizy.com/rupenapasu.pdf
    • https://uploads.strikinglycdn.com/files/55051923-3c06-43e4-b3be-299322f38e9c/your_love_never_fails_chords_piano.pdf
    • https://uploads.strikinglycdn.com/files/4ee6c895-a479-4da5-8aa4-efa65640fb77/easy_piano_songs_sheet_music_free.pdf
    • https://uploads.strikinglycdn.com/files/301483d6-156e-4632-8050-2c6af33a21f1/23320678111.pdf
    • http://nutujetis.rf.gd/jipuzixapuvosudu.pdf
    • http://nigugolesaxof.rf.gd/stephen_king_movies_in_chronological_order.pdf
    • https://uploads.strikinglycdn.com/files/17937863-c167-4626-baef-bdd380fb389b/how_do_i_get_my_brother_printer_to_scan_to_my_mac.pdf
    • https://uploads.strikinglycdn.com/files/ddee8de5-41f1-4321-8f16-6c441ac2c07a/29817922128.pdf
    • https://s3.amazonaws.com/bitajemisajoz/watubi.pdf
    • https://uploads.strikinglycdn.com/files/170b2e0a-9085-4d6b-8daf-cc14a060724b/8155949078.pdf
    • https://uploads.strikinglycdn.com/files/b74b35a6-218f-4900-a0d1-f92fa7b3d3e9/6543943078.pdf
    • http://runuwug.myartsonline.com/60246546733.pdf
    • https://uploads.strikinglycdn.com/files/dae749e2-42a6-415c-aa8b-cb2a5726ecc0/how_do_you_know_when_zagg_keyboard_is_fully_charged.pdf
    • https://s3.amazonaws.com/xazarujokemus/73691770618.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013463.bin
6339b0012905cb3f0fb59226a777fd08870b80bde4fdec62782a504ea46a34fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13463 5428 bytes
font_01_sfnt_off000146d7.bin
771d8ede819dcdf779aa46be979e33d3f4e5c3220c4fa67974daed8ba5850eb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146D7 12548 bytes

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