Malicious PDF — malware analysis report

Static analysis result for SHA-256 f165dc6ea7480a50…

MALICIOUS

PDF

83.5 KB Created: 2021-09-19 09:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 994c7a94e15901878922e24364d35631 SHA-1: 5295e2360be636b4973b51085eed965a64e246f5 SHA-256: f165dc6ea7480a50ff12b0663d8c8e3f4a3088831eff5e580176901d1a02ca4b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one specifically linking to a purported software installation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • 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://allytemp.ru/uplcv?utm_term=install+cinema+hd+on+smart+tv PDF link annotation
    • https://airflow-skateboards.com/userfiles/files/28747329379.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210919100635.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/femufigisejugojulunoj.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/wiverakuf.pdfIn PDF document text
    • https://seerupit.dk/assens/file/41675549111.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/tobarunigux.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/463ebf5e5c86209a213fe9aef0892a8d/koraxadamivo.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/89899924636.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/situmimanibebituvewigovo.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-03-23-24-30-36.pdfIn PDF document text
    • http://hueide.com/upload/files/lidipop.pdfIn PDF document text
    • http://erpos.sk/data/files/96945801332.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/70030713055.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/gufomi.pdfIn PDF document text
    • http://ossokahve.com/upload/file/jewikutapozal.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/guwelugujilowa.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/ladedawixupan.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/14725359763.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1615a2ee6---kokigilupebamagoweliv.pdfIn PDF document text
    • http://elitacasa.it/images/file/66175370570.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/xadexademu.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/12908973500.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/27154210095.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_off0000e316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE316 10652 bytes
SHA-256: c654975c41215c06789a77ffec5f72e70dd9ce903deae758b857ae90180dc187
font_01_sfnt_off0000fb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001135c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135C 17612 bytes
SHA-256: e979823ad9ea98abe13edda518c64197c292863d19d26b54a105cf7630128b2a

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