Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8fa05acc0f65942…

MALICIOUS

PDF

84.8 KB Created: 2021-09-17 05:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 78a3ab00283a773273ecd6d1258a622a SHA-1: 7723ab096cd96c1816cc6687f695d2bc01cfe116 SHA-256: b8fa05acc0f65942d6d18f1ec85224d7624d964c8e53929eb8dfc378864a14ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to potentially harmful content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to this behavior, aiming to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/uplcv?utm_term=samsung+galaxy+con+tastiera+qwerty PDF link annotation
    • http://madmojo.com/fckupload/file/jofexorup.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/xamasexedowape.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/fepewiduregimonofosaxiji.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/79845021901.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/210629a437ab9b34b241561afc079da5/tosimemojobanokiwi.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/6736073296.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/medebimonilaz.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/vumad.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202191455836.pdfIn PDF document text
    • https://lesura.net/userfiles/file/93997856404.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/78490392887.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/lezonowududitofulu.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/77991165854.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/71880224262.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/28691744010.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/xowegimelavew.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/36933321781.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/27737318348.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/69020755791.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/suxele.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/82161301112.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/korubemilifuxovas.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/mapukemobubutogegos.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_off0000e11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF933 11196 bytes
SHA-256: 8a3c1633245ccbbc3cea374dd1d772e9ce2f51296d77b79239a625649780819c
font_02_sfnt_off0001132b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132B 19308 bytes
SHA-256: 000985585d83da0eaceb369a216c0ff501ace5f4cf37396eb9ac18d6d3f1c029

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