Malicious PDF — malware analysis report

Static analysis result for SHA-256 5662143a8d79f7cb…

MALICIOUS

PDF

77.6 KB Created: 2021-04-07 03:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ccf964d72b372668c4e0b40543cdc4ba SHA-1: 19d5ce9625a892c6ce9faae7ec9b4b2906da1148 SHA-256: 5662143a8d79f7cb667219fe1ef55bbb05c39765fb77b813dec2778ae0ec829d
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominent URL pointing to 'jumiwimov.ru' and a title suggesting financial advice. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detection confirms it as Pdf.Phishing.Trojan. The ML classifier also flagged it as malicious. The presence of embedded URLs and the link farm nature strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=how+to+create+multiple+streams+of+income+in+your+20s PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4422659/normal_5ffda7cdb51bc.pdfIn PDF document text
    • http://wozuxel.getenjoyment.net/modevoxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486778/normal_5fd1f75cf06d4.pdfIn PDF document text
    • http://befelofote.iblogger.org/dozufimunudokidiw.pdfIn PDF document text
    • http://golulim.iblogger.org/trainer_asphalt_8_pc_2019.pdfIn PDF document text
    • http://supariwepexafat.mywebcommunity.org/nao_sei_como_terminar_um_relacionamento.pdfIn PDF document text
    • https://kilekawu.weebly.com/uploads/1/3/4/8/134857711/gigazawovegades_muxivitegexiru_tenaguxiwotewi_lireli.pdfIn PDF document text
    • https://kaxogirigajel.weebly.com/uploads/1/3/4/6/134611066/ratake_bupekojejamol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495681/normal_60464592e574f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492871/normal_6012642eed27e.pdfIn PDF document text
    • http://tonemisi.medianewsonline.com/gititegeva.pdfIn PDF document text
    • https://bitiwinelezom.weebly.com/uploads/1/3/1/8/131856531/kamajebevuvawa.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/lolaritemukole/asrock_z77_pro4_nvme.pdfIn PDF document text
    • http://vuguwasesa.epizy.com/57203675533.pdfIn PDF document text
    • http://piwisivajefi.rf.gd/73435684939.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/faxukel.pdfIn PDF document text
    • http://vosimamasi.epizy.com/dialyzer_reuse_guidelines.pdfIn PDF document text
    • http://gesuposobevexo.rf.gd/foundations_digital_answers_chapter_4.pdfIn PDF document text
    • http://josotemasafu.rf.gd/hardest_harry_potter_quiz_ever_made.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_off0000f1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EA 5592 bytes
SHA-256: 5404384d87858bc13b446b16852f062a970f8484a7aaa200c815996abda95e27
font_01_sfnt_off000104ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104ED 10548 bytes
SHA-256: 3d3c8af20176561a9f78f5204e7beb397b3b96ace1b3da76123ca78a17eb77f8

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