Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a2f4b5d5a548466…

MALICIOUS

PDF

74.1 KB Created: 2021-09-26 21:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 053021911fdf11296a945168351ae932 SHA-1: 879087f4503e072f6701f463295811da6ff5d316 SHA-256: 2a2f4b5d5a5484669b8ff28ac504e5da481e60c2abc352d08624f2736cfb69d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting or are part of a link farm, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://aarogyamedico.com/userfiles/file/xapevopoxawurunuzuxupu.pdf In PDF document text
    • http://nanoservice.sk/upload/file/73148905992.pdfIn PDF document text
    • http://prestopc.it/upload/file/dezupa.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/45995357797.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/99756122528.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138c21b823e1---vowadugasek.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210908004944.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/ded53fc7cb445144755b6edd42d035c2/xesuw.pdfIn PDF document text
    • http://keyday.ru/files/files/kubijapovan.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/82326180763.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/612ee18ccdfed.pdfIn PDF document text
    • http://rvhifi.cz/files/file/49498136015.pdfIn PDF document text
    • http://z500.si/files/56161019078.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/kuxake.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/69764651695.pdfIn PDF document text
    • https://airxps.com/userfiles/files/84339307105.pdfIn PDF document text
    • https://adikmanis.com/contents/files/68254044203.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/nimifutuperikirisa.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/7748380700.pdfIn PDF document text
    • https://stvorki.ru/files/file/nodezozitesovi.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/61414736508.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/35265919861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=malayalam+horoscope+appPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/33399943538.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_off0000bba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA1 10452 bytes
SHA-256: b72e43b91cbcfd7d4924e20027c7150a89637ca29164c5e54cffb032333b2cf8
font_01_sfnt_off0000d367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB79 18392 bytes
SHA-256: e73529486e038f0faa72cb5c796932329aee3fa17feb25dd6f0681a619c17c4a

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