Malicious PDF — malware analysis report

Static analysis result for SHA-256 86177bdcdeb4e085…

MALICIOUS

PDF

74.5 KB Created: 2021-09-24 17:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b3c7ab8d44685145cb7593ce2a582b8a SHA-1: f2d6846353ccaf14984877af41838865ae2a6294 SHA-256: 86177bdcdeb4e0855112eb29b6c96f73cc96897ee2ea867740aa402b996688e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the primary purpose is to redirect users to potentially harmful content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://semangkabiji.com/contents/files/31020847939.pdf In PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/90071925357.pdfIn PDF document text
    • http://gaudi.tw/upload/files/miperekupavesubapux.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/37702100882.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/worinisekakanafitif.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109050909276328.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/fupuropuv.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/wadasezeteromawutufutevo.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/86651711987.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1632319062.pdfIn PDF document text
    • http://tzsunup.com/upload/82747920393.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/girozorepunamaketufunama.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/45013787710.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/19826199835.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/30625826267.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/42292320747.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/51005097248.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/fuveronipape.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/46724238407.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109130321324984.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/falex.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/99812828875.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/51614170938.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/vilizuvijabanetet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pdf+to+excel+converter+free+download+for+windows+10PDF 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_off0000bb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6D 10900 bytes
SHA-256: f364d8e58cc6b611a780cd550af2e4e5b6b99f364b8bf081a5b42003d4c02167
font_01_sfnt_off0000d4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF9 18120 bytes
SHA-256: 48a998bd43f606d72a275d7a1dabf1fce1a821cf27e5e22f18cbd7a2da21b941