Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e01e67452a6d87…

MALICIOUS

PDF

83.0 KB Created: 2021-02-23 19:42:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fc0b1b5bdb0f9d0ec01337928577dd1d SHA-1: c73e23b737cf38bb8d0e22093ed69044d8b0604d SHA-256: 71e01e67452a6d878ff23683d59a67c399f0a714a2f60ed381f4b34fb5c37195
136 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains invisible links that redirect to a CAPTCHA-themed PDF, suggesting a phishing or credential harvesting attempt. One of the embedded URIs also points to a suspicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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://crophysi.ru/strik?utm_term=how+long+will+a+bulletproof+6.0+last PDF link annotation
    • https://cdn.sqhk.co/venifirub/hhgeDW1/30972403983.pdfIn PDF document text
    • https://cdn.sqhk.co/nogawevorus/dtggpjb/wolof_phrases_hello.pdfIn PDF document text
    • http://dodunagosukew.iblogger.org/wunderbar_german_beef_bologna_nutrition_information.pdfIn PDF document text
    • https://cdn.sqhk.co/febapaji/iiima3A/97962086994.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuronufepu/jhicq6o/befuzu.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/mejados/vererorodadaxozixakogug.pdfIn PDF document text
    • http://rikovaniroxatox.rf.gd/1._shark_navigator_lift-away_professional_upright_nv356e.pdfIn PDF document text
    • http://zuxulabawiba.rf.gd/captcha_code_full_form.pdfIn PDF document text
    • http://fatifosavo.rf.gd/indication_of_interest_template_m_a.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/human_centipede_3_deutsch.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/30692188213.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/have_to_exercises_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/oras_pokedex_completion_guide.pdfIn PDF document text
    • http://nigukeja.epizy.com/sap_basis_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/lefuwadakelosoxama.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/netgear_wnr2000v5_firmware_upgrade.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/bifijevoda.pdfIn PDF document text
    • http://jasagedonemope.epizy.com/kakadowokurulipenupuxore.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/vazajubuguwogopudumira.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_off000106da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DA 5592 bytes
SHA-256: 3b7c8af1d0495f3b1ae5c12d6fd9d7e1a9a28558ab5082c1274705e84777f414
font_01_sfnt_off00011a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A03 10636 bytes
SHA-256: c8ebb98b00c0c448825aa8110209b532f9fce175fed9b767383c51e3e90e7779

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