Malicious PDF — malware analysis report

Static analysis result for SHA-256 718c81f77170f270…

MALICIOUS

PDF

73.7 KB Created: 2021-03-09 21:08:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5e37124e142f11f2842af1d1ef1a5f79 SHA-1: 20435635659b26ac9ffa428900c8a9673e0c8a55 SHA-256: 718c81f77170f2703787eacf3be8e1c9daf879efc9b324d8c7af7856b1f24d04
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 0.9991

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://druttle.ru/strik?utm_term=how+to+open+paint+windows+8 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4487184/normal_600dfa9384b3d.pdfIn PDF document text
    • http://nesakud.mypressonline.com/best_samsung_tv_apps_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461525/normal_6008298787a9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378848/normal_5fec23d75f0d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464080/normal_602b640ce062c.pdfIn PDF document text
    • https://javaredulag.weebly.com/uploads/1/3/4/6/134611390/sopunowaxupata.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/mens_health_workout_routines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427795/normal_6047872886590.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456998/normal_5ffdb52239aa9.pdfIn PDF document text
    • https://xezinaruwi.weebly.com/uploads/1/3/4/4/134479948/fidevu_barepa_witoxuwe.pdfIn PDF document text
    • http://buvalopexur.mygamesonline.org/80252572088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450504/normal_5fe95c8102651.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411218/normal_603115e5a804f.pdfIn PDF document text
    • http://mibikazut.mypressonline.com/87468788610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460944/normal_6018b11eab19b.pdfIn PDF document text
    • https://letavozogat.weebly.com/uploads/1/3/5/9/135978758/89087524.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vobikeretuwof.atwebpages.com/befefolawufowiru.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/nefojofawowagumezozitupi.pdfIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_a7609898c5474b848ecf508f65816d7a.pdf?index=trueIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_3f327bd9d4914390aaf05e7fcd6991ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/maxububapunibagijulupo.pdfIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_0973b7296ac84f2b9b5bddaf064e885c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/cobia_fishing_report_north_carolina.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/best_ppsspp_emulator_games.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_off0000e485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE485 5072 bytes
SHA-256: 49d4d37aff68370aed5be388ee50d56cc593a762e4a4b24c9f03987dd428534b
font_01_sfnt_off0000f5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E8 10484 bytes
SHA-256: e49eed210657ec00c29f2eb5a39361a5d8ec0a89c189e1b671374d0de519809f