Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7b5a95ff1906e5…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 09:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fed2e2f6a2fe3f71d85e9a566df23bc2 SHA-1: 4ce966fc0d73eaf35a3c9f2862388d3e21e12d94 SHA-256: 8e7b5a95ff1906e5667ac91fb64d9a71ebdcaa0180090b81a3010144cf6f1768
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to suspicious domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly indicates a phishing or malware distribution attempt.

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 http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/7473339388.pdf In PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614f56c6137dc---janoginifareda.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/desonagatidubutetojowufat.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/dagozasareto.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/tatinafuxotidelad.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/23634323245.pdfIn PDF document text
    • https://ms2oke.com/contents/files/62628621972.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/3140064946.pdfIn PDF document text
    • https://kawanmto.info/contents/files/voput.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/sivofanogifinubogadixed.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/jujamun.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/76037308842.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/degedijinotij.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/kasureroxagekanizafu.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/piwozitan.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/siserusugufadokak.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/tixuxafejuxovav.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/22471617123.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/jusapenebubipefusazaweba.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/701ae69acd23d920ea109c24fc6cf2ca/zupojitijamapowoxan.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/dogizurufosawin.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/44601313645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=watch+spider+man+2+123moviesPDF 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_off0000ae15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE15 11136 bytes
SHA-256: 656a5aef30b71d5ccf25defa96d00b3bd11c6d34cae8ba5317bf5a7fbadf8472
font_01_sfnt_off0000c80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80F 16124 bytes
SHA-256: 8a3590bc02d1c940d8acdca4728ef5335943ec58e2bcbde1b0d7a51ff1153f75
font_02_sfnt_off0000f0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1