Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccef740504ee3c68…

MALICIOUS

PDF

87.3 KB Created: 2021-09-10 08:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: efe87fa8dac01f0e94eace97f70771cf SHA-1: 901913bf7768f1fb7bff0dcd97fae28546d54dd9 SHA-256: ccef740504ee3c687c2bcb8fba02f8cfefbdf1cd5748b4e4adc3fff8eb114f1b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, further supporting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://omonetach.pl/foto/ilustracje/file/14359727965.pdf In PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/xanijoxuvilupunobata.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/68163c5f422c38d5f00a9339d7ff9058/tegitovugerizinokerixe.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/92678523240.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/jeriza.pdfIn PDF document text
    • http://zae.me/datafiles/file/xuwowotirizu.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/podivifuxaba.pdfIn PDF document text
    • http://snft.ro/media/file/tivifiz.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/pifefobivowedegajimened.pdfIn PDF document text
    • http://whatdwellswithin.com/file/7817009885.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/lidad.pdfIn PDF document text
    • https://thehouseproduction.net/file/72614696895.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/kawotadiden.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/relirufiwaxebidup.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/fatuzut.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/88413855253.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/73808907262.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/15199822802.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/30072457681.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210909194715.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/lugirewodusopodogi.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/81984636683.pdfIn PDF document text
    • http://herve-coiffure.ci/files/xuvawixolazazodibaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=show+sport+tv+channelsPDF 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_off0000eecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECD 18556 bytes
SHA-256: 8c914e35a51cc52756fcdf285501a24b0dc2f0eaafaf9f7612e5345aa062831d
font_01_sfnt_off00011f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13721 10608 bytes
SHA-256: 25410faa9e2f814404cecb47c4ddc39c3d957acf0628830743f745167d581692

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