Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c9c5195022b2b5…

MALICIOUS

PDF

86.9 KB Created: 2021-05-10 16:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 20f377c2ccb677a10e188f741ac913e0 SHA-1: ee8e3b26d52c2e6c206c8a48e3664e22f0a84d03 SHA-256: 23c9c5195022b2b5065bb8f85e0add93a1986a9ba321e561cf40d6149a8dda25
186 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to disposable hosting or redirectors, forming a link farm. The document body, though garbled, suggests a lure related to setting watch times, which is likely a pretext to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://pelibifir.ru/strik?utm_term=how+to+set+the+analog+time+on+a+baby+g+shock PDF link annotation
    • https://xomadugazulu.weebly.com/uploads/1/3/4/5/134597447/fopeg-wojelinijejoze.pdfIn PDF document text
    • http://miniluk.22web.org/how_to_install_a_digital_honeywell_thermostat.pdfIn PDF document text
    • http://muluwusive.22web.org/buderus_boiler_gb142_service_manual.pdfIn PDF document text
    • http://marafonsport.site/samsung_ue50ru7470uxxu_50_smart_4k_ultra_hd_hdr_led_tvxf3ax.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/doZshdO/56633855430.pdfIn PDF document text
    • https://zizojatemizowen.weebly.com/uploads/1/3/4/0/134016780/1867852.pdfIn PDF document text
    • http://fruit-citrus.space/dibuwagavevajilesuvej7co4n.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/jjfBMo5/native_pigs_for_sale_philippines.pdfIn PDF document text
    • http://alania365.ru/dopixozosusepuziwobixosefxaoxx.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/prembhushan_ji_maharaj_ram_katha_fre27ax6.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefima/bSgjhgc/94073311523.pdfIn PDF document text
    • http://romeoplanet.club/jaxame0kq00.pdfIn PDF document text
    • https://vosafezedivoko.weebly.com/uploads/1/3/6/0/136095507/ecb70d3f46a.pdfIn PDF document text
    • http://sukovuxelex.22web.org/benefits_of_social_media_in_education.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/ckoDjd2/72636368517.pdfIn PDF document text
    • https://cdn.sqhk.co/kamavedes/3jgKfig/black_friday_sales_2020_walmart_canada.pdfIn PDF document text
    • http://tevajevidiwa.22web.org/27518839798.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_c4688cbbf27d45018de62ecf7bfd8d59.pdf?index=trueIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_9eb704b714014746a58c0bb904dbbcb5.pdf?index=trueIn PDF document text
    • https://535f918c-e50e-4760-9dbe-4b22a9cc1357.filesusr.com/ugd/65883d_1ffdaefe71d14c819453a11baba0a9d0.pdf?index=trueIn PDF document text
    • http://totoxosogazu.rf.gd/cutting_images_from.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/gubonuredeximixi.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/17655530217.pdfIn PDF document text
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_6dc451a333334785b3cd7a49bc2adb7c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/dan_brown_origin_amazon_kindle.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_off0001120c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120C 5476 bytes
SHA-256: 29eba741aaa9102675a943a6d8d94a7f26f4603bce4f5888302aad42411bab48
font_01_sfnt_off000124a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A6 11576 bytes
SHA-256: 3b449a9a0b76fea6985b5a9d80921c95b85df1f6a4338e497c7c0549b6bed3ae