Malicious PDF — malware analysis report

Static analysis result for SHA-256 925a9fdfaa7e87d4…

MALICIOUS

PDF

80.5 KB Created: 2021-10-10 09:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a819e00a7f19694fd746901963c5f52a SHA-1: b89a4c4d7cec53e57d61c44f1fb948ee909f1cb7 SHA-256: 925a9fdfaa7e87d45604d833a39b5eb5298b0546e21ad2da635de3087a677593
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=rayleigh+scattering+and+raman+scattering PDF link annotation
    • http://c-amc.com/upload/files/23137518323.pdfIn PDF document text
    • https://qud27rxl1-k61l.com/contents/files/sixokolovuvuxotenixaze.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/4959019134.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/ribunes.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/3584512930.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/fizedopetumu.pdfIn PDF document text
    • http://rentaruedas.com/files/others/walojete.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/75321029167.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/vuxideren.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615059c2355f3---95298819845.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/50878270378.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/71611027207.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/51492932705.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/dbc5784b38443c8571415862b8ae0ab5/nadimoxilokow.pdfIn PDF document text
    • http://findacommodity.com/upload/file/58022363608.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/39274809450.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/togidojesomexavik.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/35911224983.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/96426242367.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/43246688041.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/51658826252.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/56198433127.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_off0000d1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 10856 bytes
SHA-256: 89589d39227dc12c5b921a0fd8a0c3603833bbec46c0722a62994dbe4b98d2e4
font_02_sfnt_off000102aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AA 19216 bytes
SHA-256: 8fcdfbf550127f532277493fc19c9269b130434f0f3c065b433f6050215603a4

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