Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e906be98b955f45…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 17:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c9bd9d6d425a6d8f0729cd115cfaa720 SHA-1: 928899d1165170d56904e0a039406ea75220b36a SHA-256: 1e906be98b955f4551e21cb188cd87d244a1f776cf07454e6b30dedefcbb2268
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier strongly suggests malicious intent. While no scripts were directly extracted, the nature of link farms in PDFs often leads to phishing or malware downloads, aligning with Spearphishing Attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 4

  • 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://garglob.ru/uplcv?utm_term=juegos+de+vocaloid+para+android PDF link annotation
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/tozoj.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/29062071236.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/morimurimugilivamuvu.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/64325879418.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/52153585555.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/vatobigajanun.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/xejesilazo.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/fumozagixasapanilasepig.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/zebetazeputeruwejugiguz.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/15017182934.pdfIn PDF document text
    • https://kiptep.ru/file/lekagixenarufolewidud.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/pofokumirekugagijozumuk.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfb755751e---xenukokoro.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/jugizuludoraxagopido.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/kumez.pdfIn PDF document text
    • http://signauction.net/userfiles/file/ruwuxop.pdfIn PDF document text
    • http://storemisr.com/uploads/files/34054504850.pdfIn PDF document text
    • http://hidramaco.com/files/files/68386132437.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/42333017274.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/begifizabato.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/14634295367.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210908090239_476520732.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_off0000d79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79F 10748 bytes
SHA-256: 58db91cde6de49890ace883f513fee92a4792459ab4f571515a1e21d8b7b16e4
font_01_sfnt_off0000f03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 19228 bytes
SHA-256: e8baad71784b55c624faacc39034cb83e41663b1e9dc75a057a54d0f86bd2daf
font_02_sfnt_off00012154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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