Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4181edfd9369fd…

MALICIOUS

PDF

74.4 KB Created: 2021-09-16 23:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c10e7fc22133de8cff6a6e63b54858bc SHA-1: e32e1de6e0a3361c752dfa46f28861e50a548b6b SHA-256: de4181edfd9369fdf54cdf62a1d73af99adc8a3566eb2aa62554507e41f3f081
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, potentially for exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sjhrz.com/images/upload/File/64376098501.pdf In PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/jifatezimeta.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/zisokapupoxegiduwiges.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/59886423927.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/8c1612cbaba120a8346901c41f72f6f0/10458825280.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140be176f3dd---sikotiwige.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/fedejafegiduke.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/18293440206.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/riwimunutiwididokedo.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/lakovizaduvujajesorib.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/sedawakutukobo.pdfIn PDF document text
    • http://standardamulet.com/files/files/zabozivanuwiri.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/dikiximid.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/13497838740.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210905_5E5FFF9805900505.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/53006414603.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/27518327661.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/bazomixot.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/xanamogeg.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mevalagawugafowisatesal.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/pevazik.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/jinixitokeso.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/wigupememegivetileditik.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/wudubesufumejinawuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=number+one+game+gamePDF 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_off0000bfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA2 10264 bytes
SHA-256: c095c749d248fd9d2500ddcafa8dfda9d51ce37be02de3fc975244c278421a8c
font_01_sfnt_off0000d6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBC 17400 bytes
SHA-256: 50e2cddd12963a937aef6adddc3654eba344f34be15edcd6b27f011623db8315