Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45e52a00bd495ac…

MALICIOUS

PDF

82.4 KB Created: 2021-09-11 14:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 31f1f1714a75d1669d5d9f6ac47c4d4b SHA-1: 69f8261ff70925d995f4551d952a803137f0e02a SHA-256: d45e52a00bd495ac3538b9d352d121e471fbe9926705bcc79c495c2efe2f1a3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, 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, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://piauiaqui.com/ckfinder/files/futobafu.pdf In PDF document text
    • http://delfosventures.com/userfiles/files/givetefetibomosoj.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/46759706384.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/61542735999.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210910171621.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/56629713067.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210909/1248507807.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/rojowowat.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/gaposesewonabisu.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/31179549466.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/marazutibabapotiz.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/vavajakanonu.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/vogefisobajuwobut.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/sokaberujedigaxuwiredazi.pdfIn PDF document text
    • https://tsolisp.com/files/file/jedalarewininoxiw.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/bedibotatukagemakanufanal.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/90620942724.pdfIn PDF document text
    • https://kimcert.org/E/file/buvoxamusozunudu.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/kujigewagiriz.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134ca5e05c7a---20224566206.pdfIn PDF document text
    • http://husplaza.hu/editor_up/dajegetojap.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/vavewo.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/f9pqsmvp1au9kf97nj1rv3qnm0/92355526959.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/guvax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+do+i+watch+the+harry+potter+moviesPDF 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_off0000dab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 10888 bytes
SHA-256: 6c9825132f0bea83961af9167b57105a434dbed41fb7b7fdcc7af5a684831ecb
font_02_sfnt_off00010c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0A 18240 bytes
SHA-256: e117cef1eb959596d2f0f8b5c397ea429768225fb43fa355553864ac10f09fb4