Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a361b32fb621e4f…

MALICIOUS

PDF

76.2 KB Created: 2021-03-07 08:18:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f08daf1c76b8ccfb35251c7e30ce1487 SHA-1: 17b9871092137e14ccd86af666be6b5cd3dd552f SHA-256: 0a361b32fb621e4fcdccf82129e53d55b81007667c94aa0b82ce342e657e8e93
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://kuzutuzo.ru/aws?utm_term=warrior+diet+whey+protein PDF link annotation
    • https://cdn.sqhk.co/jabosuve/rhdtsWR/battle_for_the_galaxy_download_apk.pdfIn PDF document text
    • http://omerkatanalp.com/98685029502631i1.pdfIn PDF document text
    • http://buytoday.cc/baby_photo_video5kdev.pdfIn PDF document text
    • http://idealicaufficiale.website/6966154579056vyj.pdfIn PDF document text
    • http://sebaxupakokak.22web.org/how_much_does_a_nuclear_scientist_make_a_year.pdfIn PDF document text
    • http://twirlini.com/medieval_2_total_war_kingdoms_teutonic_campaigng0il5.pdfIn PDF document text
    • https://cdn.sqhk.co/morexemodoju/aS7mgiN/international_business_jobs_salary_in_canada.pdfIn PDF document text
    • http://nuxokavarop.22web.org/dlink_ac3200_price.pdfIn PDF document text
    • http://pmaider.com/apec_application_form_singapore89h3q.pdfIn PDF document text
    • https://cdn.sqhk.co/lasanamemego/idhiMqf/.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puredaw.rf.gd/autogenes_training_formel_tinnitus.pdfIn PDF document text
    • http://dajovomofoziso.rf.gd/ielts_online_exam_format.pdfIn PDF document text
    • http://puwojewemuxa.epizy.com/barbie_shopping_game_free.pdfIn PDF document text
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_1000949583e942c99f56938718985d52.pdf?index=trueIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_9e28009ccdce4f9fa7106d3a37c47ac8.pdf?index=trueIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_9534bd98532749c0972f91413a1c8d52.pdf?index=trueIn PDF document text
    • http://vadawowugozopul.epizy.com/xlsx_for_microsoft_word.pdfIn PDF document text
    • http://kinapemib.rf.gd/dukozopakojilokidodule.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_off0000ecae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAE 5044 bytes
SHA-256: 0b1169f6ece38d80539d43a98e1ba3b98f56836d3c16196562dd099c7606beea
font_01_sfnt_off0000fdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 11580 bytes
SHA-256: 2d344924d4916fee2c82dd16cdd075075d36ca643f39b6d54722ffcf85254665