Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e0f1a509896fde4…

MALICIOUS

PDF

75.8 KB Created: 2021-03-04 00:56:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ae26f6bf4586a4e53402a9c0772e9e7c SHA-1: 165ab7c6a11a101030d6dd29c982021c66206b06 SHA-256: 4e0f1a509896fde49bba536b745b463310c8d16d6154e47c844419fe3e007834
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://crophysi.ru/123?utm_term=how+to+stop+smoking+allen+carr+book PDF link annotation
    • http://kirudikegopoded.sportsontheweb.net/computational_fluid_dynamics_jobs_australia.pdfIn PDF document text
    • http://shopmzm.site/79493923409nnese.pdfIn PDF document text
    • https://ragajepegoxi.weebly.com/uploads/1/3/1/3/131379061/nibetafujupokod.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/dipimaluzejakuriviv.pdfIn PDF document text
    • http://ruwufuwetoj.mygamesonline.org/rotifonowuvekazukef.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/how_to_learn_linux_commands_online.pdfIn PDF document text
    • http://liberum.sportsontheweb.net/77359923668.pdfIn PDF document text
    • https://rerijore.weebly.com/uploads/1/3/1/8/131856643/lidejapiv-mijusoxupubax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://letutemoxeluz.onlinewebshop.net/pagatugudelupo.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/sivanabowaluvepako.pdfIn PDF document text
    • http://xuxusemo.epizy.com/demuxogulirutez.pdfIn PDF document text
    • http://xepesufotereri.rf.gd/ninja_professional_blender_1100_blade_replacement.pdfIn PDF document text
    • http://lafagelupuf.myartsonline.com/92554752955.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/kiditapog.pdfIn PDF document text
    • http://gozotonitiki.epizy.com/51111581716.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/letter_of_recommendation_for_payroll_administrator.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/ralirijebetipubozapazis.pdfIn PDF document text
    • http://tobidogajetu.onlinewebshop.net/lobimazuvuxu.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/how_to_teach_basic_paragraph_writing_2nd_grade.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_off0000e94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94D 5508 bytes
SHA-256: bf2ec6cad727a651073b82559c46f1e02c97986ac809226d180fccd235bd8b49
font_01_sfnt_off0000fc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC07 11356 bytes
SHA-256: a7d5540972abcb17c84062c76745665e10b2f04c65b7d8f3936bf4eaff916c91

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