Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0cf10ea3f232c9…

MALICIOUS

PDF

69.2 KB Created: 2021-09-15 10:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9f1e967bf95a46104e666dceeea58ea3 SHA-1: d18e94e0f8d2b2911fa448302a130c981282cdb4 SHA-256: ec0cf10ea3f232c97c20ffb7cef7b9df7c4225af9a34350af600cda3bccbfc55
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains or link farms, indicating a likely phishing or malware distribution attempt. The presence of external URIs and the overall structure suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=how+to+get+a+free+skin+in+fortnite+2021 PDF link annotation
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16133e4aab275a---sapiv.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/bamovexulemejamesipoji.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109041257113317.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/81278052613.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/50178026575.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/rodovixigixigusorovexoz.pdfIn PDF document text
    • http://lex.tj/img/file/40230199488.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/27312369634.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/72354793939.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/13766592840.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/52053907232.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/zuvina.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/zenarurejanejawamofakif.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/92864520114.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/zixilezesuvevirolelopi.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/78006346152.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210906125813.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/88909148644.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/dolug.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/lerefiwotaxajukuk.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/23375278291.pdfIn PDF document text
    • http://domuran.pl/files/file/ruxusegibawonat.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8c711d1bd---23806516262.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_off0000b0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BF 10808 bytes
SHA-256: 3ae0874d4d861e95c95a633341729a85960509c5347d8c4f0e238b42ac90191e
font_02_sfnt_off0000e1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EC 14916 bytes
SHA-256: b9f01d42ff284870450e631ef55e95a80c929f11f786b77b661d373bb80b3b40

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