Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4e8f067b88b39f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-21 18:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5a4e40eb081348e06f70895bbf058e36 SHA-1: 9e079c2c9465dd35c5fe96489ee024e07de3c737 SHA-256: 9d4e8f067b88b39f472ed543f4f710b0098a82c193fb772549bf230bb0b1b127
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript, though not fully detailed, is a common vector for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://ketchas.ru/uplcv?utm_term=how+to+move+music+from+android+to+iphone PDF link annotation
    • https://fentesmakina.com/paket/upload/files/47758279174.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/wesazatozalerolote.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/29898171925.pdfIn PDF document text
    • http://ebus.cn/up_file/file/zubusone.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140e63a75c13---tobokazuwagarubigoz.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/93552386323.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/23600077782.pdfIn PDF document text
    • http://rcot.by/pics/files/gofetenolujogivalote.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/91732792117.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/keladuruvu.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/10084751906131b49049a67.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16140cb842a643---xamubusinigabikedavemepur.pdfIn PDF document text
    • http://word.mn/uploads/assets/gamos.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/risewolabakovaziwa.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/83347612224.pdfIn PDF document text
    • https://kaimano.it/file/rudunowabodegilanijaj.pdfIn PDF document text
    • https://mangallagn.com/images/file/kokutixopabodatuja.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/niwozipimaruwawoz.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/vijedimefeguzafelixaruza.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/vobokaxomalivovu.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/linaberakaxagu.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/361900842.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/jewaso.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///3706433960.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_off0000db71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF383 18136 bytes
SHA-256: e7684e24eec76b1866167dada52935889175c696193ebfe610842ec02db8af8c
font_02_sfnt_off00012295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12295 11084 bytes
SHA-256: 6aa3c24c01f34d31638ba66613f2f2214a9a8259d941f5e6cb890bcdb3200916

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