Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc11a7cbeaac318…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 11:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c1476951e686e1b6af73bc7d0544d845 SHA-1: 5daf3e8d624962145299745dcd34764bf33dea9c SHA-256: 7bc11a7cbeaac318a9e38c698951f38132aed7caabcc7a214af4468e19e37df4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute code upon opening. It also features numerous external URIs, many of which are hosted on potentially disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://pensionpoint.cz/userfiles/files/xonoku.pdf In PDF document text
    • http://synhbio.com/upload/files/gusojivofinifigazo.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/jolazusokuxudulobiposani.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/22819667490.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613971d9f4137---dukutogaweruvarevazatisib.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/77055620863.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/21218015213.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/58193376797.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161350fd5a010d---jejevonovanov.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/8739386568.pdfIn PDF document text
    • http://tadimtursu.com/image/files/31279952700.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/wejozopubojoponazakom.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/8059684150.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/86841714304.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/78907689191.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/zefafenuzaf.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/6314983207.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/63341520604.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/powoxadetogowadebafu.pdfIn PDF document text
    • http://planbmedia.hu/files/16356060086.pdfIn PDF document text
    • http://vce34.ru/attachments/file/20954161515.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/78837149100.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/sigej.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/kutazuzevejer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=android+auto+weather+radarPDF 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_off0000dd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9D 17108 bytes
SHA-256: e03b07a2cc73643343569f559ab649a661a7abff29c78057787d2e7cf4adfc78
font_01_sfnt_off000109c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E0 10300 bytes
SHA-256: d16ec07aacb2ae78bfc9197cec21555d45c81fa9d1293d5f3ae09971ea0b27e8