Malicious PDF — malware analysis report

Static analysis result for SHA-256 fffcc15ffb87bb83…

MALICIOUS

PDF

66.0 KB Created: 2021-10-04 00:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 63e9003e86472c9cb0160acbaa849867 SHA-1: fe04d678989c7e614039c741a7d14120deac56b6 SHA-256: fffcc15ffb87bb83f7dc0786ba550fde8916f26e07b0212f568f6aa0acb16414
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, including an image-only presentation and embedded external URIs designed to redirect users to malicious sites. The presence of embedded JavaScript further suggests an intent to execute malicious code or exploit vulnerabilities. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 65 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://queure.ru/uplcv?utm_term=birth+number+9+personality PDF link annotation
    • http://wawabed.pl/uploads/userfiles/file/1844953235.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416aa6062e3---56045710455.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/81235481415.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/selukako.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/11916390452.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/lakupipapegevelimixa.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/rakuwifex.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/lovepalareka.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/24958752392.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/sokaziwixomafanefikozenar.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/79873458838.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/nulefigatanokonepeboremov.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/35939947534.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/gadugilopefipewirubotij.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/sepezadidusivexave.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/resefod.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/pawisaxiziravixejetilef.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/29957803400.pdfIn PDF document text
    • https://windsbs.biz/files/file/13007113568.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210916142706536535.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/19960628687.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/xeromebetitidomebaxo.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/vojudewekip.pdfIn 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_off0000ad4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD4B 14144 bytes
SHA-256: 6c6df6158eb3555eb89409a383ce461c94bfdeb60c244a1a5ef5b71bd84c434b
font_01_sfnt_off0000d08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A2 11092 bytes
SHA-256: 9688e99bd2edfca53b6091435580c94e01c00762ee7fa94dae27f150cfc2441d

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