Malicious PDF — malware analysis report

Static analysis result for SHA-256 207796728709e193…

MALICIOUS

PDF

75.1 KB Created: 2021-05-06 00:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fc8a0f11657100993d244c770d6e5ef8 SHA-1: b26762b8a39d9c011e619592a818251cc636f643 SHA-256: 207796728709e19380c46060e8b4651839e9745acf9244e500b2e3590da4f9fa
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 0.9993

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://dugedepap.ru/strik?utm_term=another+word+for+answer+in+math PDF link annotation
    • http://freshka.fun/nekanunds4p5.pdfIn PDF document text
    • https://pupiwikupexi.weebly.com/uploads/1/3/4/3/134348736/bb89bb7ec1.pdfIn PDF document text
    • http://nikaold.site/20782971817f64mz.pdfIn PDF document text
    • http://italywom.space/free_online_project_management_courses_with_certificates_uk6e7v8.pdfIn PDF document text
    • https://cdn.sqhk.co/tedalome/WiahjGP/zara_jeans_size_chart_cm.pdfIn PDF document text
    • http://english-10.site/resewj4fcr.pdfIn PDF document text
    • http://oneplusonemain.xyz/dd_gold_dragon_wyrmling_statsrtbyf.pdfIn PDF document text
    • https://cdn.sqhk.co/rojisixel/gektGid/dbrau_exam_date_sheet_2020.pdfIn PDF document text
    • https://vefoxetewezelir.weebly.com/uploads/1/3/1/4/131483279/mosalazadi.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/pavujiniz/narom.pdfIn PDF document text
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_039cc870b22845cdb197368fae46ddc2.pdf?index=trueIn PDF document text
    • https://3b044092-e341-4c69-a8e2-52b14fc1865f.filesusr.com/ugd/370021_4fc6b853d853476bb9c7cdcd94acaeee.pdf?index=trueIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_506c64137ba2448e935650bc202bc5ec.pdf?index=trueIn PDF document text
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_c0667528a4df4815a95b37359c0cafe0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/79012342248.pdfIn PDF document text
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_f1eba3b69d17439f877d06c507b07917.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/callrex_call_recording_software.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/paytm_apk_8._3._0.pdfIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_13faf82ab4ba4a6e89fa976ec09bfa6f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/zebitajalovetoterupugek.pdfIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_9a77388770834849b92896d198f55cdb.pdf?index=trueIn PDF document text
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_0d955112a81f4ee48717f8575579de14.pdf?index=trueIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_7b09ada96dc143f3b92e6712dea0e0da.pdf?index=trueIn 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_off0000e8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 5196 bytes
SHA-256: 662cf929f316f9b52833e34048d21e16438f82096dd5a5bf1c810667d2912c1f
font_01_sfnt_off0000fa89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA89 10752 bytes
SHA-256: 1b0983d471fff3b06c72a633ce7dfc9a0eea729a0b6e0a66ec454faa034f20ca