Malicious PDF — malware analysis report

Static analysis result for SHA-256 c745931149679f4c…

MALICIOUS

PDF

78.1 KB Created: 2021-09-18 04:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 58b75e950a62b2930dbf836ee38f72b7 SHA-1: 93a75e6810644be1796e643811cc18624c74e5b0 SHA-256: c745931149679f4c2028138eb5ca5064c8513fbf8b7f32a968480a1542010720
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a likely phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent through URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://laborke.ru/uplcv?utm_term=wet+woman+in+the+wind+movie+watch+online+free PDF link annotation
    • http://kartinatv.org/uploads/files/gigironefafogevanulitoxiz.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/lawelanododipufiwojek.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397dff9747e---49075107794.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/pebujivapepifopidojeju.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/90128207723.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/34709960976.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/46974239475.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/kenazuvogetatid.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/defovotarojizovebit.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/nexuzerevojafalerutugop.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210910121234.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/jejufipube.pdfIn PDF document text
    • http://z500.si/files/14080683683.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210906_C7B686B06378160B.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/35376962343.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/papakojaju.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/5d6cd63722ae85abbd28bc7a584d64a0/42705189170.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/53184104435.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58922246829.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/jagilo.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_off0000cbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC0 10720 bytes
SHA-256: 6e0452458b46a5923d80b3f58fc26c41a0a909f7fa5c8c1a489d1f60077f94bb
font_01_sfnt_off0000e42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3E 18032 bytes
SHA-256: 779103452cdc1b3eb7395d8892c14623de6963a520e60dc24f7b80fb006a1904

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