Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbefa4f33556516…

MALICIOUS

PDF

109.1 KB Created: 2021-02-13 14:54:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 11eb6ab4afd06e3490b778050d7d6198 SHA-1: 454ffee5e36f5a0fc698bed6a9783efb57fb848d SHA-256: efbefa4f33556516de2959914448d46007012919938059931aa4c0c28ced2542
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution attempt. The document body, though truncated, indicates a lure related to an 'instructor's manual', aligning with a spearphishing attachment tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/wix?keyword=tat2+task+3+instructor%2527s+manual PDF link annotation
    • https://jigaxokere.weebly.com/uploads/1/3/4/6/134622899/mulov.pdfIn PDF document text
    • https://teduraxiwerul.weebly.com/uploads/1/3/2/6/132681384/watetatufara.pdfIn PDF document text
    • http://fb-copyright-help-from.com/bobol_wifi_wpa2_psk_di_android47iem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://murarefap.epizy.com/fapugumegelibemebuxunovaw.pdfIn PDF document text
    • http://femodizabofowu.epizy.com/creative_resume_templates_free_psd.pdfIn PDF document text
    • http://zipokuxabatu.rf.gd/kerovux.pdfIn PDF document text
    • http://dojopugoput.epizy.com/hepatitis_b_vaccine_administration_guidelines.pdfIn PDF document text
    • http://momerulazem.rf.gd/technical_guidelines_for_digitizing_archival_materials.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/72807292423.pdfIn PDF document text
    • http://poravilotizeve.epizy.com/mega_filmes_hd_apk_1._1.pdfIn PDF document text
    • http://dojokoposexo.epizy.com/43861845568.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/20985250651.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/john_lewis_egyptian_cotton_sheets_200.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_off000170d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170D6 5288 bytes
SHA-256: 08652c50faeb43b5daca4183d1b36db23c7f949638f7af6a21e248d8514d1ca6
font_01_sfnt_off000182c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182C6 10592 bytes
SHA-256: 3b84698395ec2a0556eebffa97d46e03d8952c975279feb2d021febd2912e6e8

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