Malicious PDF — malware analysis report

Static analysis result for SHA-256 318934c75da7344c…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 21:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e1ec5dcb58c158b4f8b1acbd799a9792 SHA-1: c0a8a0d0df6432c3dc9cce423c7fec4e26617701 SHA-256: 318934c75da7344c6cea0c65b2912dcdd168caa626cd2e217232fe52e8d9c594
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to host many links on disposable domains. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it is used as a delivery mechanism, likely for phishing or to redirect users to exploit kits or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135ffbc5c41f---95510208661.pdf In PDF document text
    • http://obasekiestates.com/UserFiles/file/16302404499.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/14721505098.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/69918714860.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324863a950c---38372317640.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/jofepivapam.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/62238245405.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/xatatesimapenoxa.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/96836116924.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/zukaxurixigazanapivazuv.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210905_100443.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/72019872626.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/damiserakatibawunavow.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210906_7FF89CE88D8D7D4F.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/12269406501.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/77423834830.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/95854049972.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/7476858897.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/6990172529.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/xuzib.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/79556640367.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/getevevapuxuzapumug.pdfIn PDF document text
    • http://www.moyekolodin.com/files/kolukalewegabujemus.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/93278572420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=cardiac+system+diseases+pdfPDF 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_off0000da0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0A 16852 bytes
SHA-256: 621458b206c98a769ec2aab12d448cb8aea69b50bced9064f03aff621ebc77de
font_01_sfnt_off0001054f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D66 10656 bytes
SHA-256: 76c7c010198406694adc560ecb7f519d808db84b80e03811bef2a254bd6ae095