Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b59d696eb04111a…

MALICIOUS

PDF

83.1 KB Created: 2021-10-04 12:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 92287e140f3204349e35aafebf21e57f SHA-1: 541048be8bcfe160cd0b18bdfe2184e0cca2f591 SHA-256: 4b59d696eb04111a3a1bc4b8ce51b6ab9041894684fe2877878883cdee3bcf98
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, suggests a phishing or SEO poisoning attack. While no scripts were extracted, the structure and heuristics point towards a malicious PDF designed to redirect users to potentially harmful content.

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 http://anoh.net/pds/userfiles/files/33546016044.pdf In PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/55483036975.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/xulurorinef.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/93004819926.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/412a673c4f86528aa5aed18e96af9fe4/50806265470.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/21131920046.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/zexifif.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/31551634493.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/17261820332.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/b9542ca098ceabb25bc515e0f6713b99/66542661595.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210921_2642870AC2952733.pdfIn PDF document text
    • https://ms2oke.com/contents/files/pikonebodivax.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/45000285532.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/7752612791.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/gunun.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/mikefopod.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/41145823500.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/majudatidelifar.pdfIn PDF document text
    • http://tercovci.cz/files/file/mibezedamixagi.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/95651991397.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/guranokedubojirugerasuni.pdfIn PDF document text
    • http://watch62.ru/files/files/zejojanel.pdfIn PDF document text
    • http://findusafranchise.com/files/files/pofowubad.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/95228450587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sustainable+use+of+renewable+resourcesPDF 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_off0000da04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 20068 bytes
SHA-256: f4ecfe80568ced2e7dfa595783ba3146e1dece798c43cb388c7b5f0e322d5662
font_02_sfnt_off000125a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A8 10728 bytes
SHA-256: 9cb8942735e4fce5f7415bfcbfff75b087d8bc06f47d326d60e970cb556b690e