Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a7fabfbcfad366…

MALICIOUS

PDF

70.8 KB Created: 2021-10-01 05:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 92e50f52bbd9af935aa9d035de85844c SHA-1: 31d43950e088c5de3a1bc04012ca1e89eb08613b SHA-256: 64a7fabfbcfad366f7c6aec92c0075ba6dddbb5a955bd0433b28895f3c378c32
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a PDF link farm with numerous external URIs, many hosted on potentially disposable domains. The primary lure appears to be a link to a PDF file hosted on 'burstallconrad.com', suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://burstallconrad.com/editor_files/file/25815934850.pdf In PDF document text
    • http://nakajima-ya.com/upload/save_image/files/82428984661.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/lerabevujasikun.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/tojavow.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/tajazitazarigolam.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/72639674864.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/medofixebul.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/kulakulininogexud.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/manamam.pdfIn PDF document text
    • http://ty-int.com/files/files/wadarebumewibadujunivila.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161566f6447e21---runesevuke.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/zuxebenetuxojobusital.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/f47400435eb938e2eccba58fdf7da074.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/rusikibalitem.pdfIn PDF document text
    • http://dges.in/userfiles/file/12067342238.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/15141780518.pdfIn PDF document text
    • http://pvvc.cz/files/muzat.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/towutozefewaw.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/limirajiforaderusud.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/1810764679.pdfIn PDF document text
    • https://iohrp.org/f_files/files/xuwelenovas.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/xipewuredibomol.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/54520422949.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/jopazapetoxejo.pdfIn PDF document text
    • http://soupworld.de/upload/file/29811565422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+war+of+art+book+pdf+free+downloadPDF 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_off0000b393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB393 16424 bytes
SHA-256: efab8e4c7868951d77d7f0f7404a584e37062f5ac30b11342865398f11ba6ce3
font_01_sfnt_off0000dd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD14 10616 bytes
SHA-256: c320f05e3946fe178169aa2b47a7f2b831c572719646b0607e9952903e5bd25b
font_02_sfnt_off0000f521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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