Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b2b62873924391e…

MALICIOUS

PDF

70.8 KB Created: 2021-09-15 17:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2b7bdb0d377feadcaad37b641b093d59 SHA-1: d2096503cfa9bec7219a026a957e1ef6f3d73221 SHA-256: 0b2b62873924391e3dd5797a59f8542c3eddcdf814243b27e3f5f1f43b49b22a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and multiple external URIs, including a link farm on disposable hosting, suggesting it is used to redirect users to malicious sites. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities for client execution.

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://ketchas.ru/uplcv?utm_term=imc+planning+process+pdf PDF link annotation
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/zasasuforewuxo.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/ledetonosineg.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/sasikekabomezovaruludu.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/85091301371.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/5327756817.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/b5abcfd5f5e84a7ea8d723cd95d1e6ed/povusekiro.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/nekabobetajexit.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/jafojaz.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/87871285201.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/digivumanubexosi.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16141d4613a9e6---nisabemasi.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/gakeronagovawudivil.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/17878546427.pdfIn PDF document text
    • http://zaiger.ru/img/file/rakavufizepisofojova.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/xawumaxinezozumokipaveso.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/99720828659.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/30443570783.pdfIn PDF document text
    • https://bloc-immo.com/images/98031199625.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/nukexekajojizetenizugareb.pdfIn PDF document text
    • http://katachizu.com/img/news/files/zidikeduni.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/48332906159.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/zenipikoxunonabaramileke.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/nitajanafol.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/jipusupuponofupoke.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_off0000b7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC8 10816 bytes
SHA-256: ce6e2cc057433810f5a29c243470b5414050a6defcc134c4dd32a0a4f3c7fbc4
font_02_sfnt_off0000e870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE870 14952 bytes
SHA-256: 8440e77301f8c0cf9e42c4c8cd12b9f7a25f401ea433e29e6df9edb5d798c798