Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e40f47cf6bfc24…

MALICIOUS

PDF

72.3 KB Created: 2021-03-01 19:14:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a01a8e3e58e662ca32d4c11d19d2c1cf SHA-1: 25f0ab98169257a87fbbb90b318e82ee7bec8734 SHA-256: d5e40f47cf6bfc245837646648f4298cd451a2aab04a9f45f720659ef900e266
166 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning model and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous external URIs, many hosted on disposable domains, and is identified as a link farm. The presence of embedded URLs and the heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggest a phishing or malware distribution attempt, likely involving a password-protected archive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://zajinet.ru/strik?utm_term=unique+rare+chromosome PDF link annotation
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/loxukubaxitep-ninapebebuni-jebiwixakevoda.pdfIn PDF document text
    • http://ccckkkkk.space/scanlife_barcode_qr_reader_apk3ipho.pdfIn PDF document text
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/bibumogiwuwagoser.pdfIn PDF document text
    • http://bigno.space/htc_one_m8_charging_port_fixy0dwf.pdfIn PDF document text
    • http://healthytrands.com/linear_pair_geometry_definitionbcoj3.pdfIn PDF document text
    • https://fubexomufepa.weebly.com/uploads/1/3/4/8/134850999/f781b8de5b.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/does_1_rep_max_build_muscle.pdfIn PDF document text
    • https://lukadivosegiga.weebly.com/uploads/1/3/4/6/134679105/zijusixozokeb.pdfIn PDF document text
    • http://nexekeb.iblogger.org/dandelion_promise_piano_sheet.pdfIn PDF document text
    • http://fesadivu.iblogger.org/toru_dutt_our_casuarina_tree.pdfIn PDF document text
    • http://herss.space/44767532695kpep6.pdfIn PDF document text
    • http://dk-inc.xyz/84047880458bxyoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pakafadudu.epizy.com/christmas_flyer_free_templates.pdfIn PDF document text
    • http://xedaxabefax.rf.gd/science_reading_comprehension_worksheets_middle_school.pdfIn PDF document text
    • http://torumaxot.rf.gd/kulozelivuxizet.pdfIn PDF document text
    • http://lesesopexapawu.rf.gd/44093457734.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_off0000dec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC9 5124 bytes
SHA-256: c7daa773beb0ab69cd3ded40152e7f4d75ea61a19b801ec0b151a760643366a9
font_01_sfnt_off0000f011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF011 10828 bytes
SHA-256: 64dd5fb116b1afcf948ff90106f76948b2f5eb59b004b23b350180f8c287557e

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