Malicious PDF — malware analysis report

Static analysis result for SHA-256 c257e596d0fea582…

MALICIOUS

PDF

87.2 KB Created: 2021-09-16 01:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 02a20e3607d92de97b367293a6bb7727 SHA-1: 2dc9245f976549f1be20170b2992f5d0b3565f1d SHA-256: c257e596d0fea582b992c8be64373bcc6cc1aa56b7de5a479fd5ab8e1d6221e4
146 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to disposable hosting. The presence of an IP address in a URI suggests an attempt to bypass domain-based defenses and directly host malicious content. While no scripts were explicitly extracted, the nature of the PDF and its embedded URIs strongly suggests it's designed to redirect users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://creativetalentnetwork.com/ckfinder/userfiles/files/gimakekonidutodinad.pdf In PDF document text
    • http://dezmaster.com/userfiles/file/11431025112.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/petodagovape.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/lubajujisejazevotebid.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/56284274261.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/wolojamazekezax.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/80000040451.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/37819069944.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/33341909677.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/96111419151.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/68440443166.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/biruxabumikeforokoj.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/vorelobo.pdfIn PDF document text
    • https://expomediainc.com/upload/file/41531605845.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302eff9d30d---63978963552.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/posisenalitur.pdfIn PDF document text
    • https://ever-progress.com/upload/files/ramono.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/96397817093.pdfIn PDF document text
    • http://cssh.es/img/file/nifodivamabimujaxiveze.pdfIn PDF document text
    • http://midospa.com/upload/files/64359380305.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/xuzuvodijal.pdfPDF link annotation
    • https://perkunasstudio.com/uploads/files/202109091702525759.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/sewaveseledizitobo.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/xebiretomijaxedizu.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/poxojalekavaralupu.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109140355455837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=vulcanized+rubber+structurePDF 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_off0000eec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DC 10512 bytes
SHA-256: 21281db15b0f727c4f40d6d31de54e37ddafc75be487472fff6052362ce7a457
font_02_sfnt_off00011eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEF 18356 bytes
SHA-256: d8c766776d34d18770d6f6c952504d63c1f7187d390900c3e5d51c466a0b473a