Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e58a9a5a8147f2…

MALICIOUS

PDF

93.8 KB Created: 2021-09-16 21:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3285bfc6621aa40a8e76f11cbdac91da SHA-1: caf49d26bec6af80b5b7a8ddb6147446b51ad9fb SHA-256: f2e58a9a5a8147f2f6572ec81a6023a04e1f4f920a748ae8c9ce0afd91bafb16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attempt to redirect users to malicious content, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://ozanatalan.com/iboard/includes/userfiles/files/26931292389.pdf In PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210916_055126.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/93792366902.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/4100267941.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109111505232663.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/zaritaretoxamitivipoz.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210913001705.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/31428188207.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-2/20210902063846717563.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210913030236.pdfIn PDF document text
    • http://cl-pub.com/files/files/wamobaneno.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/34230568605.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/58912684147.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/damumowajalugaje.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/miroxemutejewajutib.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/42972803568.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/60674306668.pdfIn PDF document text
    • http://cpviettin.com/upload/files/gukavuzukegonuzososevalas.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-13/20210913185531719363.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/90341659993.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202196226355874.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6d5162500---50504910885.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/44485045940.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/67103267829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=uu+game+booster+premium+mod+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09F 16608 bytes
SHA-256: b1818888d4af7564094ea248022e90f7cca18a600f7b5b8f7732547c1cccec76
font_01_sfnt_off0000f82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001103e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103E 24496 bytes
SHA-256: 2165617d9f50d74041fd8d424a5943321eb011c45bb645622c82aa9102b89fc7
font_03_sfnt_off00014e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E39 10924 bytes
SHA-256: 53724c36d527c26f1d32049902ffd684cf32ce2ea4aa5397023129e5db29d6dd