Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d86c9d74e63aec4…

MALICIOUS

PDF

73.9 KB Created: 2021-10-04 18:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e50fdb3d18d62f9d831d0987514cf571 SHA-1: c2a1d6e8ceb49698638bc2977937a1330eaf5bfa SHA-256: 7d86c9d74e63aec4c1fb61540ae3790e5cbc7fcf4c96329fcfcfae27292fc0f5
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document contains numerous links to potentially disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gutatomusawa.pdf In PDF document text
    • http://neapol-m.ru/usr/file/23087767416.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/xarokepezulorosubodid.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/guperola.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/dafef.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/nopubozogixapiz.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/83154663825.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/guzuwozivufazomujutenumo.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/59030507606.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/64783307310.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/dajelidilotujiwi.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/7278981272.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/tidovifimuvezudotodoxal.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/69377579642.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/98110539922.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/72675182815.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/dabexopebuzukexa.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161464487c5bb0---mutegaloje.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/441777322.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/12037312855.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/30017744146.pdfIn PDF document text
    • http://tfforming.ru/d/files/75673649338.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/19185943122.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/sinom.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/16978211624.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/laguweduteleko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=financial+analyst+cover+letter+entry+levelPDF 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_off0000c1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C1 10380 bytes
SHA-256: c1d1e6a63de245b85d001b6967900ab0c232102a292090bcf2df5d4760cbf6d4
font_02_sfnt_off0000f162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF162 15980 bytes
SHA-256: 7294f031e1f3009f737edb7d85ed5ab2e5ad23472736330ff686eb6619b6ed69