Malicious PDF — malware analysis report

Static analysis result for SHA-256 f48f35eb1afef3da…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 19:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 91fbcfe1d086be050e8029a1c644cfa0 SHA-1: 2532e993722cc0b8c74c96b00b3ea4ddfc1b151d SHA-256: f48f35eb1afef3da5e9e20b763ad653c7a8faf8704279d912cb555dfb54fa0d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/uplcv?utm_term=convert+existing+android+project+to+flutter PDF link annotation
    • http://szzxwx.com/Upload/Upload/file/20219675701608.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/digiwagubenelan.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/26871040497.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/padariguziwibuniboda.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/vepajiju.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/1644328372.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/dotefarufemifofusob.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/lixadulidi.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/vamukenuvilis.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/94394969575.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/paputobinurobegimuxibaduv.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/dugatiloxojikusifululo.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/74520026911.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210914144316_1254870733.pdfIn PDF document text
    • http://micruts.org/userfiles/file/80108046741.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/vivatiwamovonuwuner.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/29973165778.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/fobib.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/metenizuxosabijeluzum.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/37884264980.pdfIn PDF document text
    • http://wwstationery.com/files/file/xupekofifemesunovuzupimeg.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_off0000d2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D5 11224 bytes
SHA-256: 054d3cdd2ca9ee90f3757d9c586245fc9cc1af76505bac01ca17c639ef8e8853
font_01_sfnt_off0000ed17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED17 19704 bytes
SHA-256: fe19a18f379f16e4f78f84747deaec5811de48729918a636629ab8043c977da8
font_02_sfnt_off00012166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12166 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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