Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9fdeb6516890b6f…

MALICIOUS

PDF

72.2 KB Created: 2021-05-15 13:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 56a8dc3463d82715fd1b17540cae7c45 SHA-1: 93dacb0cd9f824392543ed55409b3314edad54ea SHA-256: f9fdeb6516890b6fe5f2b11598cc4f4c1aed042169b74f41223b2ad47b0a0409
186 Risk Score

Malware Insights

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

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 0.9992

Heuristics 6

  • 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 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://botokaw.ru/strik?utm_term=dyson+dc39+troubleshooting+brush+not+spinning PDF link annotation
    • http://cashtanks.fun/lipuxibanenijugirrca1j.pdfIn PDF document text
    • http://miwezewavokalar.iblogger.org/72098156917.pdfIn PDF document text
    • https://cdn.sqhk.co/dasoxitif/YdGKidy/reading_worksheets_for_1st_grade.pdfIn PDF document text
    • https://cdn.sqhk.co/fumodolanes/giaxEVu/26764923335.pdfIn PDF document text
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/1149776.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/hb7Npif/zamubisodovinebu.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/hbhiuk9/download_idle_shopping_mall_mod_apk_android_1.pdfIn PDF document text
    • http://italysummer.fun/10861298728ln7oi.pdfIn PDF document text
    • https://cdn.sqhk.co/lizasizova/hjIhjJ4/39692986101.pdfIn PDF document text
    • https://nonibebufixaz.weebly.com/uploads/1/3/2/6/132682934/jujisitifuja-jonemuxas.pdfIn PDF document text
    • http://mikrotikwizard.com/dotogadozemofugusejome1m0o6.pdfIn PDF document text
    • https://cdn.sqhk.co/rukokota/jdnWieH/nonano.pdfIn PDF document text
    • https://jelamiwigu.weebly.com/uploads/1/3/1/3/131382248/zigovo.pdfIn PDF document text
    • https://sozazajigosana.weebly.com/uploads/1/3/0/7/130739782/4660067.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikureta/Xgjgiia/20339428192.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zekovulelopur.epizy.com/atheist_rap_discography.pdfIn PDF document text
    • http://dawefegoboxe.rf.gd/integers_adding_and_subtracting_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/how_many_appliances_can_a_2000_watt_generator_run.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/trane_xl90_tux_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/hr_assistant_job_description_resume.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/wizen.pdfIn PDF document text
    • http://daguwirebumovo.epizy.com/66996619196.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/28883374080.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_off0000d911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD911 5688 bytes
SHA-256: 2a4aa05fd509093207d6105c84fb9fe2e9653efeb9599ba0e1ce90725729ed28
font_01_sfnt_off0000ec63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC63 10788 bytes
SHA-256: a1578905650782fac2f9f06c3982cbb7083cef1ea2b98ae09330e19e19c3a82c

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