Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2130af01dc02e9…

MALICIOUS

PDF

69.9 KB Created: 2021-09-14 10:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3b06430e0b9b285d983ba4da70b35097 SHA-1: 329286f74a3320572844e5b4a74320d1d4ae1e5b SHA-256: 8f2130af01dc02e9d307901fd13b0b5fc25ea4ad65c1d1f02a973defaa209014
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, suggesting it functions as a link farm or phishing lure, directing users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

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 https://chcial.ru/uplcv?utm_term=linux+adb+shell PDF link annotation
    • https://mytalk7.com/_UploadFile/Images/file/63371987818.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/xodawopo.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/6033282438.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/50697963842.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/11660026619.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/88703929221.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/ffb4d35785897a783eaec13c95f37c0f/muwewuxovan.pdfIn PDF document text
    • http://midospa.com/upload/files/10760061129.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613354e132347---gesovijaduzomadefutu.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/48204194351.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/jafitefosuzevibamubu.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/21387808335.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/37953884468.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/91640556861348a2e4d9b8.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wibir.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/rowipopajevibajepoxe.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/020310123493.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/78481911373.pdfIn PDF document text
    • https://il-gusto.com/images/file/pazusikobizegugenatisela.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/nujibemadenijosotuna.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/7440574352.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_off0000b238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB238 16156 bytes
SHA-256: 911d6c404413c4616f24bf49564d1d3edde418f802187d7eecc350b7712e2130
font_01_sfnt_off0000dbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF405 10328 bytes
SHA-256: 97e2ecafb449348a074caf289b7bb0d1581180acfe9510317f74b37f043f6e5f

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