Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15f1449a01174cb…

MALICIOUS

PDF

84.0 KB Created: 2021-09-14 11:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 17b3355c44dc69f33205c4e8191225d7 SHA-1: f28b15fb96d7bcd6dfe5f11a91febc97a353783a SHA-256: b15f1449a01174cbdfddef69311228ba9bb12342ebf505a679ab90a6be4e5ea2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or spread malicious links across many domains. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://angkalaris.com/contents/files/2243034997.pdf In PDF document text
    • http://synerfreight.com/syner_upload/images/files/nifadizigewitit.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135f490d2d6e---nudafusogixuvitapi.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/falare.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/38303860379.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/beridiwamebabonojag.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/vawegexajoki.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/43027498260.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/basesuziligatij.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/12887333814.pdfIn PDF document text
    • https://iohrp.org/f_files/files/2779657928.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/97067446468.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133254ab0504---dekumemamimasawugajuwixo.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/jerokuziwizora.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/74587642741.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/65838888189.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/bugidaludawiroxuguvib.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/22451438634.pdfIn PDF document text
    • http://candientuvibra.com/images/file/begofexuvekifatemofem.pdfIn PDF document text
    • http://360global.ca/userfiles/file/7410019905.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/lufisaj.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/39197812284.pdfIn PDF document text
    • https://udruga-invalida.hr/files/60679092545.pdfIn PDF document text
    • http://yibetter.com/data/files/20890343380.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/godilodogewiziziwovub.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/27168251478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=kernel+panic+macosPDF 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_off0000e754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE754 10428 bytes
SHA-256: 8131aa9239c00185079a17377d1f4e939465da501cd3c7a04a0fc261a154ba14
font_01_sfnt_off0000fee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE5 16776 bytes
SHA-256: dc9345b76b7b8283e4bc56722e22d423a84cf644cbd1385bf5e91a9ea74291b5
font_02_sfnt_off00012a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1