Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c0a052f2c94fdb3…

MALICIOUS

PDF

73.4 KB Created: 2021-02-23 12:17:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 818d9905401526ab00647c354a238d68 SHA-1: bd30fbaf1f5db8c9c933866093538710ff33a735 SHA-256: 6c0a052f2c94fdb3dad2c600617485ff6323875b85a45507c1947ad18904ca1c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. ClamAV also detected this file as Pdf.Phishing.Trojan. The embedded URLs suggest an attempt to redirect users to phishing or malware distribution sites, likely as part of a link farm or SEO poisoning scheme.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/wb?keyword=signals%20and%20systems%202nd%20edition PDF link annotation
    • http://my-favshopc.online/41506145159fh1tx.pdfIn PDF document text
    • http://lady-bug.club/78933404277klovm.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/monograph_exampleof2j5.pdfIn PDF document text
    • https://gebobofivogaxe.weebly.com/uploads/1/3/5/3/135308574/rasuke_kokafixelo_mitizenawuz_firomujusazeje.pdfIn PDF document text
    • http://future-techno.ru/fervor_de_buenos_airesfjdf3.pdfIn PDF document text
    • http://creditscoreusa.info/hawthorne_studies_elton_mayolvenp.pdfIn PDF document text
    • http://dmdmassage.com/six_way_paragraphs_introductory_level_answer_key6fmep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nitatotol/51347738380.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/colours_worksheets_british_council.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/berozigelova.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/cheapest_android_9_tablet.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/resume_template_for_today_s_job_market.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/88163061410.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/60208442954.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/compressed_air_engine_report.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/how_to_anonymously_report_to_cps.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/barcode_samples_for_testing.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/zikaxozibolamisibip.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_off0000e18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18E 5388 bytes
SHA-256: 773df5875d5e15f7224c14bd93fffb557b775d579aef1c29a8c28c6873805caa
font_01_sfnt_off0000f3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D9 11296 bytes
SHA-256: 39435ff9a8c32220f1fc6d0d0accff7d89188d9425ed26ea2c89388f36f0bafa

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