Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf590e58c59a4d5…

MALICIOUS

PDF

76.1 KB Created: 2021-09-11 16:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3e691274ea350955739a581edf6b5a23 SHA-1: ec67a208e71656692454be3fa56dc569d37be0c7 SHA-256: bcf590e58c59a4d5f6ebf0f872f0adee036ed3dd1b1cfdcd24c0753e5806b52d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many with UTM parameters, suggesting a link farm or phishing lure. The presence of these links, combined with the PDF structure, points towards an attempt to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=f1+racing+mobile+apk PDF link annotation
    • http://jr.ac.th/ckfinder/userfiles/files/97149699039.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/37513588921.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/66566646628.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/vosopujejibuzosufena.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/sorakunumel.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/8965790140.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/dh38kaoh8euekfsjqecfnrit7b/7086408337.pdfIn PDF document text
    • https://securitydm.com/slicice/file/selozagenopidadama.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/varag.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/palabinibijanuzujex.pdfIn PDF document text
    • http://kunbot.com/upload/files/46938350761.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/89064457204.pdfIn PDF document text
    • http://cabini.it/userfiles/files/14763463035.pdfIn PDF document text
    • http://palami.by/images/file/44808479497.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/gejesesosafubele.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/tozuxogirezojanam.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/bifexituvaxadikaso.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/1349864945.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/16423651549.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kajedugubatusowelebu.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/42894101526.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/76578133638.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/gosaxidizeraxepikug.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/gutibojax.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/54588438443.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_off0000c68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68D 16900 bytes
SHA-256: 7b68e32e1f81c5a97236c964f0b907ab6dd7bb61cc5da2a698880de4c8a3ea41
font_01_sfnt_off0000f22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22C 10712 bytes
SHA-256: 5afa608d768217688dd0212e4788e115112d37b72ecaf1365c08b27bf1ec460c
font_02_sfnt_off00010a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1