Malicious PDF — malware analysis report

Static analysis result for SHA-256 4776f34acb5802ca…

MALICIOUS

PDF

80.8 KB Created: 2021-09-11 17:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e3dc405416d3c7357e5a6511cdb2c907 SHA-1: 668e36c3250f7efc7dbc79254132742e92cc47ee SHA-256: 4776f34acb5802ca411a468d46ac793fc0922883e6f15ff08ced1162918bd3a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, many of which point to other PDF files hosted on various domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates that these links are likely part of a scheme to artificially inflate search engine rankings or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://staceyasp.com/UserFiles/file/fejuriturijadasuxaraxisi.pdf In PDF document text
    • http://dintainoodle.com/uploads/files/95440424474.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/xujevupamafuman.pdfIn PDF document text
    • http://jsjxh.org/filespath/files/20210910025104.pdfIn PDF document text
    • http://djpress.pl/Image/files/19613019051.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/50639296504.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/rinesevilavifurakijaduxod.pdfIn PDF document text
    • http://happy-land.hu/editor_up/dikedepewufibosoxutepone.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/judala.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0bdc81e74---solom.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210911202621_7accx3.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/25707967347.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/32678930956.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/tamupaze.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/50551272139.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/sodumebonetakedoref.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/wajojanur.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/54314230749.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138415326d2d---galiwokaxiw.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/sososazogebubanokulun.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/41813079626.pdfIn PDF document text
    • https://wineart.online/userfiles/file/15523076620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=naruto+storm+4+android+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_off0000d668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD668 10756 bytes
SHA-256: b32e4fab966937eea5ab19375212fd5e00508fa5533e7fb12ec7b4e4d242c237
font_01_sfnt_off0000ef40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 17888 bytes
SHA-256: c47fd2b0df9dd414a180d8d05b1e6941650b6d63cf590484754b310e88db3a10
font_02_sfnt_off00011d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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