Malicious PDF — malware analysis report

Static analysis result for SHA-256 e775be94ba5f6204…

MALICIOUS

PDF

68.1 KB Created: 2021-09-29 03:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b65086f552e3e393775db1c3588684f2 SHA-1: 41a2bc193137c5d022518d22e6b88f6cbd97c22a SHA-256: e775be94ba5f620447e1f9ee9214870e75036bab8f67f289ca521d27fa044000
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristic firings indicating it is a link farm on disposable hosting, with one high-severity rule pointing to an algorithmically-generated URL. ClamAV also detected it as Pdf.Phishing.Trojan. The numerous embedded URLs suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment. No scripts were extracted, limiting the analysis of specific execution chains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.protectakoteasia.com/ckfinder/userfiles/files/gononopo.pdf In PDF document text
    • http://institutdesante.org/userfiles/file/73123174986.pdfIn PDF document text
    • http://ambulatorioveterinariosanfrancesco.com/userfiles/files/25389663608.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/29099756947.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/kubatolujugitegumodavuxi.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/11287243191.pdfIn PDF document text
    • http://standdominica.org/files/files/78271937078.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/92194412829.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/897030322.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/8fa6dd14077ef1d8bc78875979f51409/69733585374.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/tamegoxozuko.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/82566031937.pdfIn PDF document text
    • https://eslms.com/userfiles/file/rozeromuzanunuwu.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/dekisetimagawuzamusek.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/debot.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/ronazadolifuvelurofirog.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/82543611219.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/kutupesidaperelegane.pdfIn PDF document text
    • https://agermag.ro/mm/file/80400785658.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/46382215351.pdfIn PDF document text
    • https://kaparatt.com/images/File/18513037014.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/budijonazewuzigumirekoza.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/vikofugebufinozasoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+copy+apps+and+data+from+android+to+androidPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/90809754760.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_off0000ad7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58C 14572 bytes
SHA-256: cef54e2d135af8583f1510fca46988c86e06ddfc65845566e64d0ca4d6175552
font_02_sfnt_off0000ea0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0B 10792 bytes
SHA-256: 001141977995e6a49ec84608d03bbfe19e45b0be8e2aae978ee35089729dea7a