Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa112cc70778f2fa…

MALICIOUS

PDF

68.1 KB Created: 2021-09-26 01:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 079fdbbf4891db5b33a76609647786be SHA-1: d8d51cc3b5b1550dc568746b3b81e290671a00d5 SHA-256: fa112cc70778f2fac0e1e77e4103fefc394ae9d52193dae51ab09d1fb551fdb6
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it's an image-based lure with an action trigger, typical of phishing attempts. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to one of the numerous external URLs found within the document, which are hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 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.
  • 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://irlanc.ru/uplcv?utm_term=sony+android+tv+price+in+bangladesh PDF link annotation
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/10070456483.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/pumibobemuwitekipegada.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d73a3597e3---52298650046.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/bofatewuvisulevidatet.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/59422807416.pdfIn PDF document text
    • https://biomisszio.hu/tmp/lusafufusodesovuwun.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae102a398---zemotukas.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/xivabemuw.pdfIn PDF document text
    • https://akconta.com/uploads/files/vutifezowuzuw.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/zijuzexirulipabamusu.pdfIn PDF document text
    • http://elskenecologie.nl/files/65445032767.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/34651648945.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109181751238596.pdfIn PDF document text
    • http://landia-print.com/pdir/file/doxudezodalofukarusal.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/suneram.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/12889183907.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/rakiponosobisozor.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/88506429066.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/dejiganimazamugel.pdfIn PDF document text
    • http://floramarble.com/uploads/10479638328.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/vegak.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210920164344.pdfIn PDF document text
    • 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_off0000ad93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A5 14308 bytes
SHA-256: 7c8c76d16dad41a0efbd71f1213dc1f0f1bd6890e439cbca8a42aef11a6d78cf
font_02_sfnt_off0000e967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE967 11188 bytes
SHA-256: cce633464e307292ed98ce2bc8ec1f7db2ed4e0d0ab9cca14d631460223c23b9