Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83464c7604cb915…

MALICIOUS

PDF

77.8 KB Created: 2021-04-05 17:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cfdfcf4ddbbe85b37123805212b1473f SHA-1: 6946ae48bfde1642296c73d078108f91fd00951d SHA-256: e83464c7604cb9154ae64f7177a004953e82a886f91e29cbd66fd3a1d937e535
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are numeric slugs pointing to PDF files, suggesting a link farm for SEO manipulation or phishing. The primary external URI points to 'fokemale.ru', which is likely a malicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing and potentially trojan delivery.

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 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://fokemale.ru/strik?utm_term=what+does+discolored+teeth+mean PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424683/normal_605ccdca5ad52.pdfIn PDF document text
    • https://vejevidumuruje.weebly.com/uploads/1/3/5/3/135302175/ledumokepar.pdfIn PDF document text
    • https://kiniwotonupit.weebly.com/uploads/1/3/0/7/130776343/52b40e0e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489411/normal_60160b19d191f.pdfIn PDF document text
    • https://kabenodetaxixum.weebly.com/uploads/1/3/4/7/134754863/c941e9bc31c08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449984/normal_6041a05f35c87.pdfIn PDF document text
    • https://puzagetidorijes.weebly.com/uploads/1/3/4/4/134495880/lixogif.pdfIn PDF document text
    • https://rugurujumififez.weebly.com/uploads/1/3/1/3/131384765/vebidefoxopo.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/vizegemawokaxe/73347428199.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/behavioral_psychology.pdfIn PDF document text
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_6dadc1eee3e04bf8bbe557b7b0c8a2b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/hotstar_for_pc_windows_8._1_free.pdfIn PDF document text
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_39ca30bdb6eb4ceb88a5cee02841d715.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/yard_machine_snow_blower_22.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/what_is_low_calorie_at_dunkin_donuts.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/jabopuzatikag.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/toward_a_tribal_critical_race_theory_in_education_summary.pdfIn PDF document text
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_16f1d09b1e574bb4b6f347598eac20c0.pdf?index=trueIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_2079bf80de8c48549c5260dd25f9664b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/black_forest_cuckoo_clock_running_slow.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_off0000f3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E6 5192 bytes
SHA-256: cc41159852dd46ae28b3407dfb5874e863bb0244947d274845001ba9f910d0a4
font_01_sfnt_off00010570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10570 10736 bytes
SHA-256: 750fc06b7a7f05497ffb8a039ec4deac3e114f13fce5880137a01d621f54ed96

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