Malicious PDF — malware analysis report

Static analysis result for SHA-256 323df7c3c7c0cb95…

MALICIOUS

PDF

80.0 KB Created: 2021-09-11 19:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a8553050f9f0732024914a0a7a7fd427 SHA-1: 475cd096f53dc9b4bc47b6bac694df634ccd7ec3 SHA-256: 323df7c3c7c0cb9534087bd00bf1f1a1fad4eedfb20cbc69918309735a9281e1
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect the user. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly suggests the document is designed to trick the user into opening a password-protected archive, a common tactic for evading gateway security. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/2486031050.pdf In PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/63081434271.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/1283791103.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/soriwu.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/nixezibopa.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/89165425319.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/lopasid.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/0d42185c1b9b95aa00dae5090559687a/54000909616.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/81457946144.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/47518177973.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/gezevalisebu.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/sogowaxojadipuxajexili.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/pejarilexedamos.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/wubeserodefobemisatelis.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/pakifufususopotaja.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210910203148.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/luvodireba.pdfIn PDF document text
    • https://gulamanis.com/contents/files/48858742022.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb72d9a951---52360296991.pdfIn PDF document text
    • https://terracell.pt/images/file/firerikurixodajoreb.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/69651721376.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/83307916116.pdfIn PDF document text
    • http://balalajka.nu/media/78957250015.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/torefizalizonelonitidawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+reboot+motorola+phonePDF 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_off0000d265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7C 10472 bytes
SHA-256: 653fd431ddda35132ffe59604ec61cc6851f778673f3f276bb55a47b0374b706
font_02_sfnt_off000101d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 19056 bytes
SHA-256: e72b98a376cd57bb197a500a8ff95e4068d5ab22a26d4420a82596a7c15b0f04