Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fb63403d546ded…

MALICIOUS

PDF

84.5 KB Created: 2021-09-13 16:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ea9c6fee19aa82b03510c39c9aa79a03 SHA-1: c068f6359ac4f4502351a5cef13d263e127f3fc8 SHA-256: 71fb63403d546ded9928d158c644cfc160771c97bd96453039a52f1ba08c7a36
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://oniceh.ru/uplcv?utm_term=local+adb+shell+apk+download PDF link annotation
    • http://dilimkebab.com/userfiles/file/lirafegovumoverimuburajid.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/97957989764.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/33501010208.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613712d03edba---gezozaketumorivi.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/88685088287.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/69804137389.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/62971848738.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/rebegitesodamafilifilef.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/50222211173.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/54306428830.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/mikomobunimujodurunuwiso.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/8597658224.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_08_20_13_22_2790.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090114063070554.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/womikaruzonufuwugo.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/xufiduxopiboralenef.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/91035244633.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/52212525512.pdfIn PDF document text
    • http://taxfreepoint.com/file/65629086269.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/91434075350.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/fukedusuwitupikakojem.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/kigor.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/28941353606.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE1 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_01_sfnt_off0000e171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE171 10596 bytes
SHA-256: 7e0dfc915f557033b2fb6667412e6bf58efc44204e60f2f1812b8d579da59d45
font_02_sfnt_off0000f969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF969 20544 bytes
SHA-256: 8bea9b663af860404454e1f1e5dc0f008f753e2883827153b692bb5ad9d6bdd8
font_03_sfnt_off00012f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1