Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42b63d7f90ce087…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 03:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 91c437c50d359b86a0cf58ffc4a6b53a SHA-1: 613ab7cfef7177d17b4b916a5c8be23edc770a70 SHA-256: b42b63d7f90ce08726d601d956280dba2c81cecfca336008b9a51e6cc924be59
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure itself does not contain readable content, but the presence of external links and the high ML score strongly suggest it's a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://samafb.org/uploadfilefiles/saxozivi.pdf In PDF document text
    • http://newtarrytowndeli.com/uploads/files/55692808662.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210915212200.pdfIn PDF document text
    • http://gdgom.com/upload/file/21091411305320012290hi3yp4gtz9.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-08/images/files/pareb.pdfIn PDF document text
    • http://evola.it/userfiles/files/nesewanafavolaziduwedaw.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/tujerisumuto.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/lurupivenivajuvanug.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fojisenuxibedanonemumoxom.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/59276231498.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/43417230716.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/nevefisaguvo.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/20681530703.pdfIn PDF document text
    • http://e-menu.hu/editor_up/93994520930.pdfIn PDF document text
    • http://cortabellanews.com/userimages/tatevezigenotojanil.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/69796788644.pdfIn PDF document text
    • https://2winit.com/Files/files/15481969646.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/saxitututom.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/30759451891.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/marijukipitedasutejuzili.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/faloguroku.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/c8150b002330cb10bf483b5a7c18dea5/88500114890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=watch+order+of+the+phoenix+online+freePDF 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_off0000d4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B8 10644 bytes
SHA-256: 160e46c1adad24610359976ecbbf7a60696d12a3f0cf9dc3403a060722a8bfe4
font_01_sfnt_off0000ed09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 18004 bytes
SHA-256: 668ad9718e53aa161d497364402959e7192fd0bf50de35732e025e455eaf486f
font_02_sfnt_off00011bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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