Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fff4e9ecf43907d…

MALICIOUS

PDF

68.6 KB Created: 2021-09-15 10:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1281f3feebff85ac30544cd8f3615da7 SHA-1: 4be274c59cc6ff1708303368312d986ad6878ef8 SHA-256: 3fff4e9ecf43907d1cfd0631dca7debd180a96b305e4213e3994657e62c9d841
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an image-based interface and multiple external URIs, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, further supporting the phishing lure hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 0 text block(s), carries a click-outward action, and is only 68 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.
  • 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://stepasidemedical.ie/images/uploads/file/fosiwo.pdf In PDF document text
    • https://uleshuzatabc.hu/files/file/31607004898.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/nifilomawos.pdfIn PDF document text
    • https://photojet.net/userfiles/file/55281052461.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dosiwanew.pdfIn PDF document text
    • http://shopabrang.com/images/files/31162411143.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/16111844238.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/81526672436.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/79840028928.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/ribagerujazuwefiwelisurab.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-13/20210913011705439920.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/55896567369.pdfIn PDF document text
    • http://jiab.net/userData/board/file/9947345818.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/gabonikijadomatinop.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/7584907103.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/77eca92b24928ef51e7df9a379a92ea2/86348473215.pdfIn PDF document text
    • https://digireg.nu/upload/gavoxegufotapuzufope.pdfIn PDF document text
    • http://josquin-capella.de/download/4867844900.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9bbd15cee---fepidoraroresuzor.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/vamujenaka.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/funulevofanuxosokatit.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/1002609501.pdfIn PDF document text
    • https://termofriz.rs/files/40519962251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=advantages+and+disadvantages+of+using+plasticPDF 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_off0000b0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B0 14100 bytes
SHA-256: 75b321a29dde9c5d76a1d470fb9ffb24be03c00cdd75efa77a3cfe6974908c20
font_01_sfnt_off0000d36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36F 10844 bytes
SHA-256: c18621f9b6d4f1db98974154d6936a354a97f7e2d9c30421c7f5d66831801d40
font_02_sfnt_off0000ec7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1