Malicious PDF — malware analysis report

Static analysis result for SHA-256 d056a114c2777b47…

MALICIOUS

PDF

83.0 KB Created: 2021-09-09 02:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3008f2f03cd7a845555bb7702f64c3fa SHA-1: 5ce10d1b702381e447676d04d60ffa6cc9e20892 SHA-256: d056a114c2777b47a698e9adf9e42122f8d8d61af73a27016b51255d64ce521a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of external URIs and the nature of the link farm suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=galaxy+q+android PDF link annotation
    • http://tantusmarina.com/UserFiles/file/383012201.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/74758811.pdfIn PDF document text
    • https://angkalaris.com/contents/files/fofebupifojuluvupuxoro.pdfIn PDF document text
    • https://remini.hu/userfiles/file/47506687409.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/2535816208.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/14673250937.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/4637479545.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/sepenulevuwaf.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/mebofirubisi.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161335a655b90c---terubotebobo.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/pebudu.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/buwax.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/67897723858.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/76805809170.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202108311935301335.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/25901313961.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/fuwus.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/xawejujatatoxe.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/gumibimuratunufumefoda.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/15745253924.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/sezonufijufujadaf.pdfIn PDF document text
    • https://domilot.com/uploader/files/90475021460.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/ketubo.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_off0000e1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA02 17592 bytes
SHA-256: 27a108a414ca295cc345587c8d47ff13ce9ccf22a50a061d11f85d79a3176468
font_02_sfnt_off000127ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AC 10244 bytes
SHA-256: 033b631df39cff27f4d9165bc25813c5dc0f32818931199d6717e360881883fa

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