Malicious PDF — malware analysis report

Static analysis result for SHA-256 b591509a6f5286ef…

MALICIOUS

PDF

72.3 KB Created: 2021-02-22 16:54:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9b300566f559c7d0406257341f704153 SHA-1: aa864d17b17e65555b6e942b609ae50733dd762b SHA-256: b591509a6f5286ef4a497eec8d16acf16fb6d22dd72e3f917fa82c1b985898e8
116 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in callback phishing and tech-support scams. While no scripts were explicitly extracted, the presence of embedded URLs suggests the document may attempt to redirect the user to malicious content or download further payloads.

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://maypoin.ru/strik?utm_term=public+speaking+course+for+students+singapore PDF link annotation
    • https://cdn.sqhk.co/gejupajo/ehgieqm/lojixovilanefotuvajinat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392453/normal_5ff9a6f553c4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476301/normal_60130b52b9249.pdfIn PDF document text
    • https://cdn.sqhk.co/kubasovusi/EieEhaI/60036414743.pdfIn PDF document text
    • http://siankaanmexico.com/59472907410ff5u7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408174/normal_60082715b423c.pdfIn PDF document text
    • https://cdn.sqhk.co/badisasi/hgWscUJ/32814592929.pdfIn PDF document text
    • http://livethailand.fun/lagu_boyolali_kota_susuzz3hc.pdfIn PDF document text
    • http://heliusdesign.ru/google_earnings_report_q2_2018y9cjy.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/jfBiddl/xebanosuzegi.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/XhdjfPE/frozen_yoghurt_ice_cream_maker_recipe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465003/normal_5fcb526ac1b5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464530/normal_5fe41ab701cad.pdfIn PDF document text
    • https://cdn.sqhk.co/tenalewi/hi6iepF/53910872745.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/jadudusujuje/investing_tips_for_beginners_reddit.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_off0000dbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD9 5528 bytes
SHA-256: 10efce385ce43fafebfbe253ee6f7682effdcae743399c53c054bac2b445e379
font_01_sfnt_off0000eeaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAF 10828 bytes
SHA-256: 716320f91dbc4b139cd6915fb5e0fddfb1929bbe28e79c7882e0aa3944738a79

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