Malicious PDF — malware analysis report

Static analysis result for SHA-256 8578261068d5aca1…

MALICIOUS

PDF

72.9 KB Created: 2021-03-26 15:13:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9e00e8a0a4842876b790de9a658ea253 SHA-1: 7533991ba90582b9ed2a94ce9687b9bf2b008b00 SHA-256: 8578261068d5aca147daa8d7a7dd5e6c9ae9e7633277ff889c0cc34083a7c92e
134 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a phishing lure, specifically mentioning an 'invoice or payment language paired with an action verb'. The presence of multiple external URIs, including one flagged as a link farm on disposable hosting, suggests an attempt to redirect the user to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jumiwimov.ru/123?utm_term=alconchoice+rebate+redemption+form PDF link annotation
    • http://femesugubu.iblogger.org/how_to_video_call_with_amazon_echo_show_5.pdfIn PDF document text
    • http://fusojosejivo.iblogger.org/ctv_news_toronto_health_reporter.pdfIn PDF document text
    • https://cdn.sqhk.co/zupivikeg/ggiiYji/kendall_kylie_fuzzy_cardigan.pdfIn PDF document text
    • https://cdn.sqhk.co/lajawawinu/jd103Az/van_gameren_f1_twitter.pdfIn PDF document text
    • https://cdn.sqhk.co/dufolatik/k1qhiid/44516047529.pdfIn PDF document text
    • http://xidemapewa.22web.org/rolomused.pdfIn PDF document text
    • http://dulugidi.iblogger.org/60640433691.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://reledolikivep.epizy.com/budget_envelope_templates.pdfIn PDF document text
    • http://getidevip.epizy.com/38075212568.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/tafowidemus.pdfIn PDF document text
    • http://pesaforasipu.epizy.com/zofazumud.pdfIn PDF document text
    • http://zaximibirada.epizy.com/hsc_part_2_result_2020_karachi_board.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/dumeset.pdfIn PDF document text
    • http://regipikiwubadov.epizy.com/bibi_bourelly_album.pdfIn PDF document text
    • http://xegunapajom.epizy.com/rujaguzeziguwu.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/xatinawawizaj.pdfIn PDF document text
    • http://wigeriwo.rf.gd/venor.pdfIn PDF document text
    • http://nazewomufewe.rf.gd/kafka_the_castle_analysis.pdfIn PDF document text
    • http://gusegata.epizy.com/harman_p38_pellet_stove_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/constitutional_convention_and_the_constitution_quiz_answers.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_off0000e0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D8 5348 bytes
SHA-256: aa6939c654376ef42d8fcef6a3d83ae543455d4e2452abd37926bec0c2ddc564
font_01_sfnt_off0000f2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D7 10396 bytes
SHA-256: 74e744bda8b1178dc62035bdf85e17716fbf81d6d0751024b1df4adc0b392752

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