Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f923ba568c7b016…

MALICIOUS

PDF

83.4 KB Created: 2021-09-09 06:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7f2601076f2a85abbf851fe0002e81fa SHA-1: 0889661717243d3e2c7b6ddbb867f551c66d84bc SHA-256: 9f923ba568c7b016f56c3f1083efff8ac74cf486f757376432cfc6fb6dec0c05
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with many pointing to unknown or potentially malicious domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and a link farm heuristic further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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 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://pecsikult.hu/files/file/pazafuripiguv.pdf In PDF document text
    • http://klm-co.ru/foto/ck/files/95389411583.pdfIn PDF document text
    • https://bataretak.com/img/files/file/41557294517.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/21106025077.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/86704136102.pdfIn PDF document text
    • https://sainaudit.mn/File/zezadoboxojabalobidab.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/31662414665.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/67539361979.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/dogur.pdfIn PDF document text
    • https://stotex.rs/files/jufoxurojinukizo.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/98367185682.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/jajosusaseleborepav.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/29394495245.pdfIn PDF document text
    • http://yanartextil.com/firma/files/palasunisegijo.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134b8cc0a654---97011824747.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/2149836697.pdfIn PDF document text
    • http://hotechike.com/files/files/65100750753.pdfIn PDF document text
    • http://szpk.hu/_user/file/welapowowubo.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/7941874296.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/69932686636.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139046e22706---xobozozuxope.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/33063291846.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/xukumaguwotuwagazi.pdfIn PDF document text
    • http://bakoca.hu/files/file/rexirotamizerejanaliziru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=spider+man+miles+morales+on+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9ED 20436 bytes
SHA-256: 39c10660eed3064a0f85cea708d6d58d382a492e66b8be4341183644f3e617ca
font_01_sfnt_off00010fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E3 10532 bytes
SHA-256: db97aca9764be8965930f4d624f91d216925886fc1bb3234551a2b639a1fb4cd