Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4784c0a3c63b59…

MALICIOUS

PDF

84.8 KB Created: 2021-09-19 23:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 85da276941fed0f293462e9d8f8dfbe0 SHA-1: 74411bbb2837b78cd2aee53705898f60fff19c97 SHA-256: 2c4784c0a3c63b59fc3f3f0eba7f0b8d6e2bcfc9f8952d171a774860898cbecb
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to PDF files on distinct hosts, suggests a link farm designed to manipulate search engine results or distribute further malicious content. The document body is heavily obfuscated and contains no readable text, preventing a more specific analysis of its lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://targhevaticane.it/userfiles/files/kavobagiwomonew.pdf In PDF document text
    • http://clairerolo.com/userfiles/file/paxelag.pdfIn PDF document text
    • http://3q1p.com/upload/file/210912041752211001m86kie465zm9.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/dolobagijexusajukepixivi.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/vabakonilesukelemi.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/96975093810.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/81059797450.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091411553882.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210905_27EDCD77A821A6A2.pdfIn PDF document text
    • http://benrassam.com/uploads/files/koxasamakav.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/56001524844.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/32004095715.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/22136401644.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/69647138404.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/jajofaxugupesa.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/febekiwib.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/56520135684.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133e9702fbf2---setikusipogev.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/64697964769.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-1/20210901154934101996.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/38036055792.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/752969483314afe10b82a7f4467d0145/rejefugabitev.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/82640660261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=xnxx+games+androidPDF 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_off0000ea1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10235 10556 bytes
SHA-256: 2159520f4da99a37d39814876417356be7aa65145db901ebaef89b839c5822cf
font_02_sfnt_off00011a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A04 17172 bytes
SHA-256: 9737c403139748fdb3c2f8f02ec8a4ff7b4f73d498fae592192072e46a3da118