Malicious PDF — malware analysis report

Static analysis result for SHA-256 f267ef9f15bb05b4…

MALICIOUS

PDF

147.7 KB Created: 2021-04-17 15:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d28aafdc383fd1019b86f81fec044057 SHA-1: 78fc97b4f3df1bdae916d5f577262a7b3c8728d7 SHA-256: f267ef9f15bb05b4eb9a5236ca4f80d7f248d0efb87f116d332aee3703912ff0
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/strik'. This URL is the primary indicator of malicious intent, likely serving as a lure for phishing or to download further malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/strik?utm_term=principio+autonomia+titulos+de+credito In PDF document text
    • https://cdn-cms.f-static.net/uploads/4471711/normal_6018faa330fce.pdfIn PDF document text
    • https://pujapuvefebawu.weebly.com/uploads/1/3/4/5/134581836/f773e585898.pdfIn PDF document text
    • https://xefulexemifin.weebly.com/uploads/1/3/1/3/131398452/f9a115063b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379859/normal_600739b4f3010.pdfIn PDF document text
    • http://puwexakibo.iblogger.org/acer_aspire_v5-471_battery_removal.pdfIn PDF document text
    • https://fiwudarive.weebly.com/uploads/1/3/0/7/130775392/66a50cfb.pdfIn PDF document text
    • http://buvofigutunam.22web.org/balujomapolipezikawaxakud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447465/normal_602ce4dd5ffbd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_7e62c4363d114f23b0c3154ce00931f7.pdf?index=trueIn PDF document text
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_c234d2e3cd9548969b3adce3f080f162.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liluvad/afjet_afyonspor_forma_numaralar.pdfIn PDF document text
    • http://kobewanen.rf.gd/estudio_de_mercado_segun_autores.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/avanza_tipe_e_manual_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/information_asymmetry_economics_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/abdul_kalam_quotes_in_malayalam.pdfIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_d1c548c16f4a43eca0a3363fbde3de29.pdf?index=trueIn PDF document text
    • http://lawodedizijipem.epizy.com/orthographic_projection_exercises_and_solutions.pdfIn PDF document text
    • http://wukosow.epizy.com/64174096678.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/52168694350.pdfIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_8d6452d81c5a4af996661c2bfc1d83e0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/bolusemibixu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001f2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F2EC 5220 bytes
SHA-256: 4003e3778ac76e7ae57091d486ed5306ef81b070caeb29e2c7864f62365a8c7f
font_01_sfnt_off00020492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20492 11028 bytes
SHA-256: 97dd5a7dfb4207ca25a28a2ec3693588edd29a5346cd4a31d56aae0badb44da1
font_02_sfnt_off0002297e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2297E 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf

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