Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d40b1933d76e0f…

MALICIOUS

PDF

86.5 KB Created: 2021-09-15 22:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a5987cad3db5708d80d2f652e90e56a5 SHA-1: bd162e68d6934b0d1967874390e8b8a0f3cc0c6d SHA-256: 42d40b1933d76e0fe17fb097f93c4c9d64dff358214b8b5ab7b79eec24fa5e1d
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by an ML classifier as malicious. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior, with many distinct hosts and UTM parameters used in the URLs. While no scripts were explicitly extracted, the nature of the embedded links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 4

  • 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://archism.ru/uplcv?utm_term=cheat+pour+jeux+android PDF link annotation
    • https://www.prshots.com/ckfinder/userfiles/files/texejixiravajako.pdfIn PDF document text
    • http://samtekelektrik.com/files/70305524375.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/55203845103.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/eb4a08fe1a3965b196122ba25083e456/radotuxudugake.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/10199178266.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/90975015795.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/nogidobarezawugufomatu.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/22690264709.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/848019409.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/129127508.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/mofejiga.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/24324266612.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/velulinaduxi.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/pewum.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/62950224563.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/pamufiku.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/pimujepek.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/27542898744.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/duvomarikaw.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/9926130404.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/fewubonedakifapawab.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/89152634341.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/sanogupalinefebed.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/jeraguduvuwujozadovi.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/51955142407.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/37914745982.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c149875498---7985791938.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_off0000ebbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CE 18552 bytes
SHA-256: 0d5323af1f4f28c18e18fc19e2fbdbfbf1a4ed174c724e85b99137f3bfa97f5d
font_02_sfnt_off000132a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A1 10640 bytes
SHA-256: 63e14046c7ddbb52f185f483fb1ce2710b2b5075c1a1019cfd6343ccfa9e6ebe

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