Malicious PDF — malware analysis report

Static analysis result for SHA-256 12fdc62c3e7515d4…

MALICIOUS

PDF

78.5 KB Created: 2021-09-11 06:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a8457b96eb56827b80ddbb702fbb9ec3 SHA-1: 837991141f1da9c33962cd57fcd1988356fbd9bf SHA-256: 12fdc62c3e7515d4be9cb943654e3a740267c5ed0ff7ce8dc8224b0d26416490
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is often used to obfuscate malicious actions. The PDF also contains numerous external URIs, one of which is a redirector disguised as a Google Play Store download link, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://pixomot.ru/uplcv?utm_term=google+play+store+android+market+download PDF link annotation
    • http://managhantasala.net/mailuserfiles/file/wexopejaduzowa.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336e70e3640---lujesujobimusetawav.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/25202928371.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/3975435060.pdfIn PDF document text
    • https://podimercrm.com/img/files/nojitumil.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/xabupu.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-08/images/files/38211698011.pdfIn PDF document text
    • http://ore-processing.ru/d/files/mabatojepuzif.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/43379419192.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/70781692120.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/30081384880.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///60032543360.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ce7cb7c04---17424854186.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/sefunelajef.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/lozojamupetuzijufekuto.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/49026704328.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/litemadijeve.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/50453575268.pdfIn PDF document text
    • http://sinostandards.net/upload/files/konozub.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/25952390486.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/roduzidiminatezinefumizu.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/donamegizotufolif.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/xitamulegemojujazuval.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/leduniterujigo.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/timetobajakadunuku.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_off0000ccc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D2 17512 bytes
SHA-256: ecfbb544a82fc6787f4745e77f783a3ff796241c632b0f7fc5b270f9e9854149
font_02_sfnt_off00011252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11252 11064 bytes
SHA-256: 8f3a79701b55bbee43d58bd22d31bf133c99ae51548c907d4beb7e62c3814fcd