Malicious PDF — malware analysis report

Static analysis result for SHA-256 932cd5bd72e02356…

MALICIOUS

PDF

75.1 KB Created: 2021-09-09 23:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c86a23277f26353c15a82ff62d1cac4f SHA-1: d12118699e4e0fb07d251dc3d382063aaedf4370 SHA-256: 932cd5bd72e02356cce711bbaae2b18ab66558ed5dbcae551ec36e38ca809919
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a link farm designed to manipulate search engine results or distribute further payloads. While no scripts were explicitly extracted, the presence of numerous embedded URLs points towards a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://mu-rrrc.com/userfiles/file/sumujok.pdf In PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/37014162940.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/jonakog.pdfIn PDF document text
    • http://ud2-140.com/files/14037580560.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/24eca4d06d4114771a0e5f44bf948452/55432604862.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/99034714224.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/kawofinogoketagoxup.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/bulevikoganubabirovez.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/63568880591.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/68744418125.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/fepolebinutufinadol.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/sojodilewopekakafo.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/bipufarisexolobinuf.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136026dbb232---97608206565.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/wivonomunederagonak.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/mukagelaxetuj.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109090608211061.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/93603190307.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/12099270859.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/2011320309.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/67241539892.pdfIn PDF document text
    • http://skupka54.ru/upload/m/pejeko.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/59951293858.pdfIn PDF document text
    • http://baove247.org/upload/files/nikovamatawatez.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/3190381134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+activate+voice+command+on+android+autoPDF 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_off0000c20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC20D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1F 17260 bytes
SHA-256: 6e8e8796bb73e76ecb5518f0e170458178330a43b2fc14170971a12db8ba3532
font_02_sfnt_off000106b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B3 10560 bytes
SHA-256: bb1c1857289eeec0b0fe779240bf15bbd21ce2a69110cb8611dfa01f33f0b609