Malicious PDF — malware analysis report

Static analysis result for SHA-256 50805f9ea7443984…

MALICIOUS

PDF

96.6 KB Created: 2021-09-11 15:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 011869812916f43dcb388dcfc22cf199 SHA-1: 74af31547e0aeafb105714b2617d2783d59040ab SHA-256: 50805f9ea7443984c9a26f8fefce2397e1de7fd741de1ac4ef60547b93845b05
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, presenting numerous links to other PDF files hosted on various domains, likely to obscure the malicious intent and evade detection. While no scripts were directly extracted, the presence of embedded URLs and the overall structure suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.ks-klinika.ru/ckfinder/userfiles/files/dasajoruzibo.pdf In PDF document text
    • https://digireg.lu/upload/jojamafutaxarudobidabuvap.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/18395254681.pdfIn PDF document text
    • http://e-sheremet.com/img/2010707477.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/solomunako.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/gozebixabopobosemaxe.pdfIn PDF document text
    • http://climtech.com/files/files/26799174748.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/80769582670.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/jujegosoretuz.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/rafiv.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/dodafini.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/39545836818.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16136c5cd03699---rijutu.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/wosusobizudak.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/15225335192.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/89159002425.pdfIn PDF document text
    • https://ratodua.com/contents/files/99995724468.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/84247381007.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/5dcdf9b6b1b0c8e41a6c31846af7d382/41422253062.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/birazuporovipajunus.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/gipenidexojifemesakevofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=paw+patrol+the+full+moviePDF 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_off0001111c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111C 19492 bytes
SHA-256: 44fb136b860c6d63edeecf538eebbfeb7ba7e0479effb3d3a37731608956a2e0
font_01_sfnt_off000144d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D2 10604 bytes
SHA-256: 7019b8524e5b60ac9c8bfc8c780fa07e25fa6bb6dd5b589bdfd6cd938b6ffc08
font_02_sfnt_off00015d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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