Malicious PDF — malware analysis report

Static analysis result for SHA-256 97859c130baf70d5…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 21:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 594ff2d456a15ff074678a2b696e08ac SHA-1: 463cb3e360a8ffcf6c32d4958286d1bd50303875 SHA-256: 97859c130baf70d57123227daf30c52cfbccbdc9fdfbad19c55487b4b8a46078
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a tactic of using many links on disposable hosting, likely to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.nvsrolko.org/ckfinder/userfiles/files/69537347597.pdf In PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/d2619028dcc36d22adab6528487ccc5d/rovunajakake.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/suwuro.pdfIn PDF document text
    • https://blogsma.com/files/sozirudubizisasazevamup.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/40011986351.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/80892895690.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/82855794869.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/jumiduliputa.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/67208807134.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/98217434332.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210909054438.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323c4da6746---vumukixi.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/xipugevumowa.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/zalifenino.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/lojowawule.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/jojopew.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/runare.pdfIn PDF document text
    • http://djapm.com/userfiles/file/nabopofajite.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109061521158489.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109111658371038.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/87426367441.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/bizobifogini.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/90229261055.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/67925510658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=bared+to+you+free+downloadPDF 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_off0000dfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCD 10440 bytes
SHA-256: d2f9b0a7d1dbc0edf2de8129290b72e47784d1608dcded2584358ba42ba66191
font_01_sfnt_off0000f7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCA 18056 bytes
SHA-256: cc562b51b3c45ebffefc3ede53c0c9daabfe8f8d09a6522d726ffb71b9ef494a

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