Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e379010b3d23f49…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 20:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fa938f4b1d0f1b004802c81a374ae4f8 SHA-1: 7cfaef5154dbc7cd2dfda9c1d02940b6f020d1a3 SHA-256: 0e379010b3d23f490d9d35281cbf1d29597901b5160b82e8735ed9c381bd4cd0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malicious content or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://artemon.nl/userfiles/file/gojifoluwubo.pdf In PDF document text
    • https://thaiwoodengames.com/files/upload/files/fofazo.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109052302006802.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/70948438653.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/guziwixekulinepuxebe.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/suwenu.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/garotepamezinelizo.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/mikixakuvagij.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613256243a15b---29763284129.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/3550908513.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/warapeguzibilasoz.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/38506877827.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/4595466200.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/vewota.pdfIn PDF document text
    • http://www.buildonhope.org/file/fugupuguxenazozunududuvo.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/tisixakas.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/mapenemivenofureroxun.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/tigiwujolilujikerusepu.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/rogegilorewopixozerozexa.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/18684692225.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/daronajuduxok.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090901020173499.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/semitewoxamefobu.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/26393332385.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/73673960417.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/tapokunikad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=download+vice+city+for+androidPDF 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_off0000de83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE83 17728 bytes
SHA-256: 8eac7b28e21d17b354c55871c5dcb970e8aeca4a52fd6a41b098c682f859acd5
font_01_sfnt_off00010c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C82 10568 bytes
SHA-256: 1d935eecb1691aa0263ea9a25e43d14c9e39736d98de6091bb665cc8c057daf7
font_02_sfnt_off000124cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1