Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8007522ca52c839…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 06:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 440efb2b1ae62bb17937d9af789b9c47 SHA-1: 695f7d696375b046d8530f3620f21acbe148e7f9 SHA-256: a8007522ca52c839ad513e21d052e7e859a8a6c6d644e6cbf1c662c3bcb6c427
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a malicious document, including malformed streams and a high ML classifier score. It contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting a phishing or malware distribution attempt. The presence of external URIs and the overall structure indicate an effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://allytemp.ru/uplcv?utm_term=transferring+pictures+from+samsung+galaxy+to+pc PDF link annotation
    • http://edituj.cz/res/file/fimogarujoxukupetu.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/4961971144.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/43293186061.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/98972186890.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/19544827495.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/16732835426.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/nefufisakiros.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/nesigegudebite.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/66097506229.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/24049933333.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/jobezarem.pdfIn PDF document text
    • http://vuason.vn/upload/files/pabatojisazalolowijap.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/dolajegotu.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/xewewidedo.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/51460494566.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/21098030128.pdfIn PDF document text
    • http://fitviewer.de/files/file/16350017848.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/34648274889.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613753ee7eb04---kagemagu.pdfIn PDF document text
    • http://nineslash.com/user_file/file/lefoxibajojofeme.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/96889243581.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/xadirazokomut.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/niwexomezugazuwolur.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_off0000cf2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE741 17752 bytes
SHA-256: 70f595eac7536cb0bb5db7e81b0cb29ab10b7115f4458294ff25a9c50fa3f6bd
font_02_sfnt_off00011556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11556 11104 bytes
SHA-256: 059af5d0ad44be16c4d631494dee260d8cf63436b0e6ade5ca2e9d7838ad80db

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