Malicious PDF — malware analysis report

Static analysis result for SHA-256 e587287a475e9ec5…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 15:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 42d8f7c0dd3c26a4ce0c50195a34cc39 SHA-1: ff64f34c96dbf80fec3e43e091af0b431ac257c2 SHA-256: e587287a475e9ec56404e20cd9ffc1c933ce1d27b45c9c990d5df9b84112afdf
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document is designed to host numerous links on disposable domains, likely for phishing or malware distribution. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://chcial.ru/uplcv?utm_term=uno+and+friends+apk PDF link annotation
    • http://sasolution.kr/userfiles/file/wixixuxerojewevutife.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210907_230547.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/62526794773.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/pujuwunipaxetibuzi.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/lekenufoxepafixonorub.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/gatovaxumumirelu.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/legewuloriroroduza.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/mozukaralupufupu.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/davogagusi.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210919_33E21B56A478AF9A.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/nirikusijururuj.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/4969023798.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/teliv.pdfIn PDF document text
    • https://limsurdua.com/contents/files/pofamoselinutulanu.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/39847223467.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/57769022439.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161327f20b77fd---mezawilujad.pdfPDF link annotation
    • http://sonhanint.com/uploadpic/sun/files/202109181054481002.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f258b12f37---ropejok.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/36945940216.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/nobikimaxife.pdfIn PDF document text
    • https://manenshop.com/upload/files/18708578583.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/rigezitativorifomepid.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/tifet.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/2444311514.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_off0000d647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD647 17740 bytes
SHA-256: d5e3e216f1dbbe04ec8d9424affd005d7fb43ffff85a4908800db0d1189636a6
font_01_sfnt_off0001047b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047B 10448 bytes
SHA-256: a7414312c5f545c6c2e1f8e5031a81ba1ff9cd5320e9e3ddb595687460c9abca
font_02_sfnt_off00011c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1