Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f72dca7b4afdc07…

MALICIOUS

PDF

80.7 KB Created: 2021-09-21 16:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3129d3099461baffb292ba896e65d0b9 SHA-1: e8232a2914276888de46db5c060e9b97765e2aa9 SHA-256: 8f72dca7b4afdc070cef28d4c1624f7dd8a8b2b9f929056cfcc0bef4ee93d46b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to PDF files on potentially disposable domains, suggests a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://orlickachata.cz/files/files/84439468094.pdf In PDF document text
    • https://ppkh.net/userfiles/file/nupilivomazilugutujexu.pdfIn PDF document text
    • http://isitekmuhendislik.com/userfiles/file/reburiworuredadeje.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/gaminor.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/nulowapulujimipanuw.pdfIn PDF document text
    • http://masihpt2.com/contents/files/21557355228.pdfIn PDF document text
    • http://slotkuda.com/contents/files/fogepumesojisaxoriz.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/uen3q4ltt5armtqrajmkccch7g/wopiloxajis.pdfIn PDF document text
    • http://isvpro.com/custom/files/depazokukot.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/tutaga.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/59839227605.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/balufezijamifulukifek.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/digebopiwuwosogipapadi.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16146bb2fee5bb---jerewo.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/babizotokexedifavowuxelob.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/49115556280.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/38273482231.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/tamow.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/xozabojelajarewi.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/lusoxanulisakatutew.pdfIn PDF document text
    • https://novsport.com/content/File/10110849323.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/nifapudofatadawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=cartoon+maker+mod+apkPDF 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_off0000d309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD309 19580 bytes
SHA-256: 00a2aab0db7c892400f33213b565dd6cb890392c8afb1c7a890c11108f0ac7d7
font_01_sfnt_off0001065b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E72 10368 bytes
SHA-256: 6097dd3bf457f5c5d55a84cc1414fbb4902cbccb15c8c3070d9c49b6e26e0e00

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