Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3eb7c8550797595…

MALICIOUS

PDF

120.5 KB Created: 2021-09-08 18:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5cff2e44da336c5a1344a4caa69aed85 SHA-1: 4202f79c3a9f3a62ac3c0c3c2e77f12760649d5b SHA-256: e3eb7c85507975951acc4585a7d3be472e171a6e9a3f384eab809a81756c2de1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting, suggesting a link farm or phishing operation. The PDF structure and embedded URIs are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://crysiq.ru/uplcv?utm_term=oral+exfoliative+cytology+pdf PDF link annotation
    • http://qazaqbanki.kz/data/content/files/jibirutoxuvusunon.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/1049713487.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/10595583239.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/50318221494.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/zeduwekilerixinisemujov.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/guxekerumumerini.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/45093465657.pdfIn PDF document text
    • http://adriennemason.com/assets/files/50669640660.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/monaxurowazatojebituwama.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/duximisigaxomidamotuner.pdfIn PDF document text
    • https://e-midas.ro/files/file/sogigusinedabomuni.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/60607601234.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/29672614658.pdfIn PDF document text
    • https://brukspec.pl/upload/file/76065877220.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/wezezejikurusepap.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/62184707240.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/kuxapobuguroridegin.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/varapufatefenupibawu.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/vanikodu.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/basomowamumokil.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/13769590606.pdfIn PDF document text
    • 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_off00016f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F32 20124 bytes
SHA-256: 665225d6b8444096acc575e11af8df6da0461e8d688837030f7b53b193551dd2
font_01_sfnt_off0001a361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A361 10832 bytes
SHA-256: 9ce1dba48074ef4e39c08604e81e6f704ac3ac01aac776df658a1794044b55d4
font_02_sfnt_off0001bc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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