Malicious PDF — malware analysis report

Static analysis result for SHA-256 9752d57ca35e48bc…

MALICIOUS

PDF

79.4 KB Created: 2021-09-13 01:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 860140949c29b4135a8a2ea59e10b103 SHA-1: 494c469629dbf65cbf0253cddc6a76867dcb643f SHA-256: 9752d57ca35e48bc85de12bac258b20007e46840b85b02ccf86129d22698132b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable domains, indicating a link farm designed for phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://e68momo.com/shopadmin/upload/files/75157696734.pdf In PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/xumatux.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/11057794002.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/32526829716.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/6525898270.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161375a54a6563---88565421105.pdfIn PDF document text
    • http://4yoga.by/pics/files/komefofebudas.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/35251443034.pdfIn PDF document text
    • http://unsersohn.ch/images/file/reponifapodelerivina.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/bolego.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/55411178201.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/58636783970.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/gelimof.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/95611878454.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/76830507617.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/dexaditawufaraxojem.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/balavevedeso.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/verigutebavudusupag.pdfIn PDF document text
    • http://gibisch.biz/files/files/95775715469.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/86435356654.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/zepolimaguxomimikavexaxe.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/mepaditifutalaf.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/72245147414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=a2+grammar+exercises+pdfPDF 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_off0000d0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CD 10800 bytes
SHA-256: 5f3ce6b809757dded83d766db2ecc408e1fce1ac04ab08c3454fe6912279e8f7
font_01_sfnt_off0000e99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AD 18016 bytes
SHA-256: 2c59828a5cbd97ed8a9cc51b4ae0acbcce37ce4c090f94db0f5f7ba3318b0607

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