Malicious PDF — malware analysis report

Static analysis result for SHA-256 671a19bc7c662983…

MALICIOUS

PDF

83.6 KB Created: 2021-09-23 06:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c3c00fa7951355eb0377bf4d5c04ee62 SHA-1: 8c516d74ec9bee9883046df325ece17a82f239cf SHA-256: 671a19bc7c6629834c921fd88e17d88c2801b398eb4a383cbe857a3a1a566b9c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.cda.org.hk/ckfinder/userfiles/files/296657882.pdf In PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/raved.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/xasov.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210906140052.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/74128439432.pdfIn PDF document text
    • http://hanauhrova.cz/files/kinowoverijopezepe.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/xasajoxa.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/waledase.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/zuferonuxawakekugavopajaz.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/20fk23f8t827k8kv725rdkp3am/45957627351.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/8000989490.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/kixarulexakididomujunave.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/26229682590.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/fajugoruzek.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109151802457065.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/ropudizigo.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/9598704688.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/wajilonevezen.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/vakepomonofodeledunotidid.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/jekonarudowagi.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/71941755651.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/dozem.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/1550193409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=assistant+menu+appPDF 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_off0000e4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD2 17308 bytes
SHA-256: e30b91c8fd7a38e2934419614547bbe8cfb2f1e9d2776fb5afe7f81c5dc4a2eb
font_02_sfnt_off000129e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E8 10228 bytes
SHA-256: 7925abf8f26f6e50e55e8ff7ec9a1d55df0713bc8fa4d6ea727756bef655f6a7

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