Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c5f94636b7abd6…

MALICIOUS

PDF

64.9 KB Created: 2021-09-13 00:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bc842de94017a9958b45f648c138829a SHA-1: 6e10f8c6e8f27be1f00118a8688a72ac3d29d373 SHA-256: 81c5f94636b7abd699e7a626c6e11f92fd54ea8b3778ea42d934ee8019f9746c
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a phishing lure, including an image-only presentation and a small file size, designed to entice users to click on external links. The embedded JavaScript stream and numerous external URIs, some hosted on disposable domains, suggest an attempt to download a second-stage payload or redirect users to a malicious site. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4651

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 64 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
  • 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://crysiq.ru/uplcv?utm_term=final+cut+pro+download+apk PDF link annotation
    • http://www.romanschatztruhe.de/img/files/tovelilisobobav.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/gokixirebazegupu.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/45566986806.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/58757876048.pdfIn PDF document text
    • https://susta.vn/userfiles/file/50971446200.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/74531644610.pdfIn PDF document text
    • http://tchid.net/userfiles/file/fabaguf.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/zebejabuvodaperotamato.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/80268781847.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/9db3d451592c0f44481f4c345bf39dd4/jijoxuxexolom.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/bifikorusuvatigu.pdfIn PDF document text
    • https://endobible.com/userfiles/file/88622848759.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/59058158963.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/51240346973.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/meponopasifaxafo.pdfIn PDF document text
    • https://shevian.com/images/file/sakubip.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/89904015660.pdfIn PDF document text
    • http://taigesw.com/upload/files/jodevuxixojorubawo.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/bosabuporulutageb.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/715003646.pdfIn PDF document text
    • http://cartopack.be/Images/file/tilidawojejotamadutinapo.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_off0000ac44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC44 14248 bytes
SHA-256: fdab67903a99dbf6d6bcebee4f74d991158034444aff61b8990275d67b7e53ba
font_01_sfnt_off0000cf4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4E 10464 bytes
SHA-256: 12802f282e67deb54d4d6c8d0367b1452b47f9e65a9d81fdf896220d3100e47a
font_02_sfnt_off0000e731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE731 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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