Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b832a3aec212850…

MALICIOUS

PDF

67.4 KB Created: 2021-09-29 14:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f1d6e92270d9bc515323b387997434f7 SHA-1: f62e2b8c0f3309a0efd7fa98e922e4ceaa605eec SHA-256: 8b832a3aec2128506f0d1925766778e1bcc40899b456fd1dc5bed9adccb5dc89
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It employs an image-only lure, typical of phishing, to entice users to click on a link. The PDF contains embedded JavaScript, suggesting an attempt to execute malicious code or redirect the user to a malicious site. Multiple external URLs were extracted, indicating a potential distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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 67 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 http://casaledellasignora.it/userfiles/files/jetuniguf.pdf In PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/632908c7a5ab3c1c7647b4f1861a018f/14830142937.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/vipaworimujarabelajevaxo.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/kunibajemono.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/94221148411.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/xomokanusaribafesuz.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/76065976988.pdfIn PDF document text
    • http://4bx.pl/public/file/wisigilorudowomebewin.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/31738126336.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/zasedubatavi.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/rijiwapi.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/75324837845.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/dibokedododadulutega.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/xafenupozipisotaza.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/goluwoxurufederal.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/fopiselulu.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/tepuduvi.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/zezagerozimuloxemeb.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/giwafuvokugupotun.pdfIn PDF document text
    • https://norservis.com/files/files/duvogubipikisaponujediv.pdfIn PDF document text
    • https://fishboat.hr/files/95623699084.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/26892342870.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/newove.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109120842529466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pikashow+app+linkPDF 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_off0000ad55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD55 13856 bytes
SHA-256: 5866cbb1dc1950335947211fa3aa4a36673729eef5a0dcfb49deef05e78fa5a6
font_01_sfnt_off0000cfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD3 10196 bytes
SHA-256: 48ebd4f7707b05884127c3872c2de9eab1711c0cfd6032ce4a8922bddf79f046
font_02_sfnt_off0000e6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1