Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1212ea5603bc672…

MALICIOUS

PDF

70.7 KB Created: 2021-09-18 14:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5a36263c93dbbbc96a1c9d3b9e034185 SHA-1: 512cfe711875564bc4db4946ed6126a388d0e568 SHA-256: e1212ea5603bc672a2c6503283359a90a46060e15355dbbee6ba458cb9e26e69
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external PDF files hosted on distinct domains. The embedded URLs and the PDF's structure suggest an attempt to manipulate search engine results or distribute further malicious content.

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://pure-chiral.com/upload/files/99572508340.pdf In PDF document text
    • http://umrllc.com/userfiles/files/perukiwaz.pdfIn PDF document text
    • http://aurora-c.jp/files/files/43169583346.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/3015663976.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/ridiwuwajo.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79470930137.pdfIn PDF document text
    • http://okvin.org/userfiles/file/xasokufi.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/suvupanavikupemesevalab.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/vitajegadigupulaxewumug.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/95914195532.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/niejn8v82i4le5k4j4elkaaib7/fudumisazofemidozosuv.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109082259569989.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/zilojedudekobuz.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/tizikunakixonejogolut.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/foxuba.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/vivuvikagebasi.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/95987799257.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/zazeroxolugijijumamotitur.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/belesafegifetopufemeni.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/xoduka.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/55713557011.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/tufususasevimo.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/c33b1df94c9280e56522013a3ef3b18b/zixub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=dress+removing+photo+editor+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_off0000b359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB70 10952 bytes
SHA-256: a58982a8eb1ac6aade0018d20ba3e9b0241f90b70c44b3a2dfc3ef3eba3c9bb2
font_02_sfnt_off0000e479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE479 15972 bytes
SHA-256: 5c826ca4f901d59746ab2b6254faa9d644662af48d5610eee9881b46c7c43537

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