Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fcaed5fa3b22f13…

MALICIOUS

PDF

94.0 KB Created: 2021-09-18 03:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e76234d73f56b2732d1a8699276be0d8 SHA-1: 6fc9ba64d6c8b8e6301fec6da1e065fa262e7bf9 SHA-256: 6fcaed5fa3b22f139125c905e12ac23da521e450f795282a21c706501438d231
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as malicious by ML classifiers and ClamAV. It also functions as a link farm, directing users to numerous external URLs, some of which are hosted on disposable domains. The presence of JavaScript suggests an attempt to execute malicious code, likely to download further payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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
  • 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://savytrading.com/userfiles/file/1724797868.pdf In PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/799765639cf2d2cb09b7320a44a3d4c2/10816366786.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/jomosipawulufifigowoxasep.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/sevurakajarovalov.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/wagafinakafiza.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/28a6e6214ec5b8d650845301de0ec35a.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/naguxosidofib.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/80375225242.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/98130659606.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/85430972624.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/60207639619.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb1252cdeb---73222950928.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/25025872514.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/kizilida.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/50771999707.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/dujuzowumuk.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/57096951794.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/4560474078.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/tevimuvozezorivapewiwuju.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/55789748825.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/gukupelobedapuxafumixa.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/35725013939.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/86824186987.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/duguroraseduduv.pdfIn PDF document text
    • http://halaljones.com/uploads/files/vafupefulimewalu.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/fadiromixugovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=erotic+novels+free+downloadPDF 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_off00010a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12232 18496 bytes
SHA-256: 2dd9a4517223bd461214a2bfd3f5b8dd66fe07a5bed70366879a228904c13825
font_02_sfnt_off00015209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15209 10604 bytes
SHA-256: bba19013cf781e97e07beb75b7229d89ae225da4e9664da90f032b5bbe81c2b6