Malicious PDF — malware analysis report

Static analysis result for SHA-256 97651cb3d08793cd…

MALICIOUS

PDF

71.6 KB Created: 2021-04-29 03:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 486940461cabd576c0bf876f43752246 SHA-1: 9f33069d7f85ef385af3c7cac954079dec7e4468 SHA-256: 97651cb3d08793cd29b01bec15fda96aed106c826743096bf42f21beda54f8d4
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 0.9998

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://vilenefex.ru/strik?utm_term=what+is+the+basic+purpose+of+constitutional+checks+and+balances PDF link annotation
    • https://mobiduretul.weebly.com/uploads/1/3/4/6/134681609/lakijigigopopaguzami.pdfIn PDF document text
    • https://cdn.sqhk.co/bipozipo/jh3idgd/80403597697.pdfIn PDF document text
    • https://gikotaduxig.weebly.com/uploads/1/3/1/4/131454052/9337328.pdfIn PDF document text
    • http://seritepaxuv.22web.org/burda_patronen.pdfIn PDF document text
    • http://jijugibafob.iblogger.org/sorting_algorithms_examples.pdfIn PDF document text
    • http://vamolufu.getenjoyment.net/pablo_neruda_100_love_sonnets_download.pdfIn PDF document text
    • https://gomisixazu.weebly.com/uploads/1/3/1/4/131437427/3263825.pdfIn PDF document text
    • https://cdn.sqhk.co/jijatidos/giieiao/cotton_candy_movie_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/kelarega/i3jfg0I/44229983860.pdfIn PDF document text
    • https://cdn.sqhk.co/tajixixejafi/rGCIhgy/levumisazobuz.pdfIn PDF document text
    • https://fisezogidegogef.weebly.com/uploads/1/3/2/3/132303301/8733984.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwuxa/QkjbeaG/35145547895.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/ifgeNjd/lofuke.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/igihitJ/air_traffic_controller_jobs_texas.pdfIn PDF document text
    • http://zuwujamoruwipam.22web.org/adding_decimal_worksheets_5th_grade.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/jeiiifD/loborakujelorim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jolasesiv.epizy.com/kuxajoko.pdfIn PDF document text
    • http://fojakosi.atwebpages.com/7035290234.pdfIn PDF document text
    • http://gevazobi.rf.gd/45876833435.pdfIn PDF document text
    • http://kimawawasero.onlinewebshop.net/gegujutam.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_off0000dcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAF 5460 bytes
SHA-256: 4088e044bcc2e88f830f0a5970cbfb2ac416db212bfa07b43d7974539659e13f
font_01_sfnt_off0000ef3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 9732 bytes
SHA-256: 5b19cb70fc4e277e09d8dfa7a7e33d06fd869cfa0b5550ca346a9c490973a5b9

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