Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f890f10120ee78…

MALICIOUS

PDF

98.2 KB Created: 2021-10-10 01:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2e01ef8f967a70ea72439f614aee5dd5 SHA-1: 3dd7b494789531fd942d1ac7843db5eb6bdca3ac SHA-256: c9f890f10120ee785418b15d51d556845fc1f73812ff4abebe826d0c5f908122
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous external domains. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://nguyenthaotech.com/upload/files/53023464291.pdf In PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/weguwepabapazetavomi.pdfIn PDF document text
    • https://maisonforville.be/documents/file/zafolikapubuvuvi.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210901161254.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/kijadusezafekuzosi.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/dasaseg.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/fozinekasapukovowul.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/40865796916.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/nabamefoz.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/21232076952.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/96294806420.pdfIn PDF document text
    • https://istanajp.net/contents/files/20257337412.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/kolud.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109160253046596.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/foxexoremukerelofa.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/wetenunaguji.pdfIn PDF document text
    • https://web-idea.ro/app/webroot/files/userfiles/files/14913288677.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/xavapijopefubebopubusuj.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/topiwe.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/13080774373.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/lolisofatarakel.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/larazonumorexurel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=escargot+in+puff+pastryPDF 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_off00011059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001286b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286B 22672 bytes
SHA-256: d3ee5b18b489dcf7b8cad0b9f6f476157f17d34ee78d5989a57cc4d0ff763bae
font_02_sfnt_off00016262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16262 10676 bytes
SHA-256: bbccf7e73acf0a504b6e4f49d05b5e382e719a2b1916a9c22c8b22ed39b4f949

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