Malicious PDF — malware analysis report

Static analysis result for SHA-256 d30a506d3e6ab7d5…

MALICIOUS

PDF

73.7 KB Created: 2021-09-22 15:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6cb96284b828f1c3bc0205d3badf864e SHA-1: 78face1863ff256ac8980ca0841aeb3f0b3b2f2c SHA-256: d30a506d3e6ab7d55787b03f6addabaabe0634143eb15b096b6860633cbe6956
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting. The PDF structure suggests it's designed as a link farm, likely to redirect users to phishing sites or download further malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=peritonitis+asociada+a+dialisis+peritoneal+pdf PDF link annotation
    • http://skazka76.ru/pic/userfile/mofuzapure.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210920145755.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/11019598724.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/fipaliveke.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/dexigo.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/setozedozazubupe.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/38097260200.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/51918208852.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/32144462344.pdfIn PDF document text
    • https://questyme.com/userfiles/file/2641322776.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/17282395571.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/23284159003.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/kudulapewitu.pdfIn PDF document text
    • http://senkyu.jp/webroot/img/files/83749644681.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/31953934477.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/mujovavebojakozap.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/boledijavivipijadodekef.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/73547172683.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/subowomokisuk.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/30782907255.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161413ab3e19d2---jasazemodugogomigaroninot.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/39509968118.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecaaf5ac72---85967747876.pdfIn PDF document text
    • http://scro.ru/pic/file/bibotukufibukidesizodog.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_off0000b9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D5 18100 bytes
SHA-256: ae7a1b01a8b547d6ab49dbf301cb3d3df9bed4ea15268a33059143a946312ee5
font_01_sfnt_off0000e8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D8 10616 bytes
SHA-256: 0da07efd38e57771bb27dfba80f68d85bce4d341dd230b535ec337b5c503ddbb