Malicious PDF — malware analysis report

Static analysis result for SHA-256 871689dd2deae540…

MALICIOUS

PDF

66.8 KB Created: 2021-02-05 09:13:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1b09e10ca6c73f9048d24fd46456a4ee SHA-1: a8399ee63738c381596df9aeffe72fc4fe0b21a7 SHA-256: 871689dd2deae5401b478751be9424a1b38ea4722880c8076c19d2bb2d875efa
116 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the document prompts the user to call a phone number. While no scripts were explicitly extracted, the presence of external URIs and the nature of the lure point towards a phishing attack, likely delivered as a spearphishing attachment.

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://jacksth.ru/aws?utm_term=air+locker+installation+guide PDF link annotation
    • http://cartest.pro/38643560943vpwfb.pdfIn PDF document text
    • http://copyrightshelpscenters.com/3631876019ibkse.pdfIn PDF document text
    • https://cdn.sqhk.co/lodikorep/jjgfrBk/assistive_touch_not_working_on_lock_screen.pdfIn PDF document text
    • http://nubolats.xyz/resumen_celestina_por_actosmzmng.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/EX7u0ij/dipojunarizikoku.pdfIn PDF document text
    • http://grizhoff.ru/tutagaiglir.pdfIn PDF document text
    • http://shopeuro.pro/24808410148s2rgx.pdfIn PDF document text
    • http://tublitalia.space/81211207918qzzbt.pdfIn PDF document text
    • https://cdn.sqhk.co/gazejuruni/6vyiPA3/zofor.pdfIn PDF document text
    • http://capridigi.com/analysis_toolpak_mac_excel_2011ax7y7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486350/normal_601c71a129d09.pdfIn PDF document text
    • http://counterman.ru/gogotevudi0rawx.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/megulu/constraint_guideline_percent.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/addison_wesley_science_10.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/95822167393.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/61259855919.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_off0000cbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDB 5160 bytes
SHA-256: 13b4b8bad3c2f2f2f62c23fbd76bd66ce1a0418d36a89faf62dc9392cb38e9b7
font_01_sfnt_off0000dd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD76 9636 bytes
SHA-256: 8cf7dd3babe4c7ebc0ae06648e2fc05be1114ee37c30c65cd2eb9cb2cab15d0a

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