Malicious PDF — malware analysis report

Static analysis result for SHA-256 545ac17458e20538…

MALICIOUS

PDF

77.7 KB Created: 2021-09-09 04:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c23d3ca84c3212d8bcfe1c24734fa909 SHA-1: 9f7de3a533354bc5b298a1437af1277eba3cb930 SHA-256: 545ac17458e20538d4611b769f10e2ee5309f44e4ec5c6eda0444a50edc35a74
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The heuristics indicate the PDF acts as a link farm, directing users to numerous distinct domains, many of which are likely disposable or used for malicious purposes. The presence of multiple unknown URLs suggests the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://jaurrieta.net/USERFILES_JAURRIETA/files/90366088614.pdf In PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/82330499723.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/91733918083.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/tezulomuwalezotagilojoti.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/punubagosibivasaxas.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/11337484894.pdfIn PDF document text
    • https://porfic.com/fotos/file/xedafukuromimabod.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613937849b936---26650723328.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/52120363617.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/radivafunabotosipin.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/64257586848.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/zegibovolubokugokij.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/75574982505.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/goxipamozulop.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/88592628195.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/duzusisemifixubutukepa.pdfIn PDF document text
    • http://baoveantam.info/upload/files/penexazodenegobaz.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/76773779107.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/liwixava.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/62876678080.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/kininotabiniwemuride.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/92360860353.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81489615273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=1337x+uk+proxyPDF 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_off0000cdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD8 10028 bytes
SHA-256: ab2223e2521a4abd1c0d0dce527173ef415ad16202a6bdfdb03510246221715b
font_01_sfnt_off0000e44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44A 17672 bytes
SHA-256: f5c54499b0759331d2d8005ac7b954f9e980b7799ccbfc9e522b9ef13ee4f39e
font_02_sfnt_off000111d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1