Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea89af53cb1a1093…

MALICIOUS

PDF

94.7 KB Created: 2021-09-17 02:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bfed723487b521ae6f74f77c41c9c16a SHA-1: 53e2099a38ed0641c6ba8f551d92e3ff4c26a626 SHA-256: ea89af53cb1a10937c31ab73318bcdabe646d2cb913ec203f7f5b026d2f68c35
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on disposable hosting, reinforcing the malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF format itself can facilitate the execution of malicious JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://irlanc.ru/uplcv?utm_term=combustion+of+coke+equation PDF link annotation
    • https://giriconsultancy.com/content_files/files/71701258802.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/46098782115.pdfIn PDF document text
    • http://yuha.be/_files/file/57844390075.pdfIn PDF document text
    • https://safehouseservices.in/fckfiles/file/mojeluben.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/51512067233.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/tafadogat.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/sikejepigikozap.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/toserixegiriwiwa.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/14897818495.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/13896793827.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b22b475b435ccff7e8684d2febe9c27a/xolapijakepesuji.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/16225004797.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/988963381.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/86219505791.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/81095882504.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/64675783110.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/gokugapejuwepagazasapilin.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/84766373604.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210917_66ACA81CA460D82A.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/13250988142.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/2350207033.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/18433289916.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/72813590339.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/61504285172.pdfIn PDF document text
    • 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_off00010860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12072 19556 bytes
SHA-256: 747a4b7536c22e77fac407f956a1e2cdc21e04cb14da31e7a2ff6df9fc0421d6
font_02_sfnt_off000153f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153F4 10860 bytes
SHA-256: 7b58cbb0dfae44349e37638d5898c02fd15202f27e464ba53e60ca960daabb44

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