Malicious PDF — malware analysis report

Static analysis result for SHA-256 597945747b6b60df…

MALICIOUS

PDF

130.2 KB Created: 2021-04-03 17:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5b4203088678f38d4701f7601590464d SHA-1: ecbb2e6e944be450a4d5756f60c48e6c6072018a SHA-256: 597945747b6b60df35fd76bf4b3f6215eb9bba970497facc6455b8877220f258
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URIs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/wix?keyword=ucsd+cse+127+reddit PDF link annotation
    • http://firstflirts.site/repotivalefoxokexbs3eq.pdfIn PDF document text
    • http://tifusavegapawuf.mygamesonline.org/automatic_voltage_regulator_avr.pdfIn PDF document text
    • https://bevozuvegala.weebly.com/uploads/1/3/3/9/133999301/1338201.pdfIn PDF document text
    • http://xodaxedepapopox.mygamesonline.org/xuloguwitumumikugofoz.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/eNwjlfl/pediatric_neurologist_staten_island.pdfIn PDF document text
    • http://ninomut.sportsontheweb.net/acer_aspire_e15_review_philippines.pdfIn PDF document text
    • http://kuboduzuke.mypressonline.com/rutanizupurokizurapek.pdfIn PDF document text
    • https://nuzojumikosa.weebly.com/uploads/1/3/0/8/130814298/591e5ad8.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/hihahiS/sound_meter_decibel_meter.pdfIn PDF document text
    • http://duzegipim.22web.org/aparato_digestivo_organos_y_funciones.pdfIn PDF document text
    • https://nitesefoxon.weebly.com/uploads/1/3/1/4/131453907/9744321.pdfIn PDF document text
    • https://zepitobazelaki.weebly.com/uploads/1/3/4/6/134619491/e43e2063.pdfIn PDF document text
    • http://basvuruizleme.online/liderazgo_transformacional_y_transaccionalaw3ss.pdfIn PDF document text
    • https://cdn.sqhk.co/xamowizaso/ajhc0A9/assassin_s_creed_2_pc_trainer.pdfIn PDF document text
    • http://izzzaaa.space/17830129955p5pu1.pdfIn PDF document text
    • http://jiwabozaxexe.mypressonline.com/76585874460.pdfIn PDF document text
    • http://rezotu.xyz/modern_poetry_books_like_milk_and_honeyg8t4q.pdfIn PDF document text
    • https://basalolevezuw.weebly.com/uploads/1/3/1/6/131606508/fofosasifupal.pdfIn PDF document text
    • http://zuvibig.22web.org/juzowaxo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_a0ace96b13224cdcb34ffa97f9619dda.pdf?index=trueIn PDF document text
    • https://a0e9597c-cfbb-4fc1-b0e0-47ed6411b148.filesusr.com/ugd/24269e_592a6e06c70a46b2b68f67a00ffe0c6e.pdf?index=trueIn PDF document text
    • http://durapufagumupo.rf.gd/60544541921.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_off0001c4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4DE 4944 bytes
SHA-256: c6868919e89f6eed77cdb2bbab6f3d8b54fa8a90d43c468ad907023b356d38a4
font_01_sfnt_off0001d5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5D3 10984 bytes
SHA-256: 73d8dd6c1e418a27eaab9ec65017d0c1e54e96b85e4ba908a0a09069a88d0228

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