Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc56f4c3983378df…

MALICIOUS

PDF

70.6 KB Created: 2021-09-13 05:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 75eb3af1e381e82713a3116065a6fe3a SHA-1: e7a81cb3e34eff33d23ac5fcbc48b75808ca871a SHA-256: bc56f4c3983378dfbcc5aefce37757c6ca56da285dd7e17682cdde9be3df5d9c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on disposable domains. While no scripts were explicitly extracted, the nature of the embedded links and the 'link farm' heuristic suggest an attempt to redirect users to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://jpjplumbingandheating.com/FCKeditor/file/35416670235.pdf In PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/49277403508.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/97412639856.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/nojokawegefomejesirirab.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/35652341570.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210903_7AFF565CAA274F32.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/sonafige.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/13978460705.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/61167361811.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/norikurivuvetanejaju.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/82167975580.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/5107401200.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/bobudakanino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=sky+emulator+apkPDF 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_off0000b2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EC 10432 bytes
SHA-256: d1c91103011f97dbd25224b91970f1288c144c615619090fe9213a6ef80a0a84
font_01_sfnt_off0000cab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB2 16696 bytes
SHA-256: e3e4bd4b036920021956d297d3957b922acf52aa08855f4fedc53870c4a59169
font_02_sfnt_off0000f5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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