Malicious PDF — malware analysis report

Static analysis result for SHA-256 609c463b349771a0…

MALICIOUS

PDF

74.2 KB Created: 2021-02-22 23:59:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2e48d6d8dd12968ea07531f52828ed2b SHA-1: a1705e25d67cecbb8c64d0dc69b238db45c214ff SHA-256: 609c463b349771a0b0ce006d8435cfb789773ce5000392a7cb67f5e4b45cb172
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1059 Command and Scripting Interpreter T1203 Exploitation for Client Execution

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were explicitly extracted, the PDF structure and external URI suggest it may exploit vulnerabilities or embed malicious content to facilitate this lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/strik?utm_term=what+color+are+dachshunds PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369191/normal_603233219635e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384628/normal_5ffa9c877d63a.pdfIn PDF document text
    • https://cdn.sqhk.co/belerudoxej/Zje8ibh/5220230669.pdfIn PDF document text
    • http://creditstar-kabinet.com/notarized_proof_of_residency_lettere6w3x.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/bijhbJv/download_crossy_crash_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/QIzhfhc/new_york_times_subscription_cancellation_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/hiugcii/rnb_music_download_zip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475571/normal_602cb74a7661b.pdfIn PDF document text
    • https://cdn.sqhk.co/fufejapopunu/4dHrbhd/dazapasiwuzupenone.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/nawosineromigi/best_free_android_phone_cleaner_app.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/chisholm_online_enrolment_form_login.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/vmware_workstation_12_keygen.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/appbounty_mod_apk_2019.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_off0000e6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E3 5040 bytes
SHA-256: 977d393c06903649f45ddb9c6aac09a9e4155d69aa0a5e559d3df500100ac5f6
font_01_sfnt_off0000f805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 10588 bytes
SHA-256: 86d6e7e46707d97e9b8ee7b9f67b38455a37037797a8a9d25d988ada17b95aba

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