Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fce1dd0ee7bc9e6…

MALICIOUS

PDF

74.3 KB Created: 2021-02-28 22:22:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13a8823999cf1641576ad1b931c27888 SHA-1: 1c0d6d0a39b36615986f55993cb2c9fc6ea2637f SHA-256: 9fce1dd0ee7bc9e6a3f4bb870d3acac86a548da686e2d181860d36cea43bd3e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on external domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malicious content. The embedded URLs suggest a coordinated effort to direct users to a network of linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/123?utm_term=what+is+the+hardest+question+you+have+to+answer
    • https://pefodiral.weebly.com/uploads/1/3/4/4/134476409/kosezuruvusivivino.pdf
    • https://cdn.sqhk.co/murofoli/1jj5xgd/resident_evil_7_ps4_review.pdf
    • https://saboruxeketeg.weebly.com/uploads/1/3/4/8/134850947/51a5d3be9ac.pdf
    • https://cdn.sqhk.co/josurowelimu/iadTDie/77709399071.pdf
    • https://cdn.sqhk.co/palubavuz/Dnycjjn/salagetopatinumufu.pdf
    • https://cdn.sqhk.co/budajawisore/jahciht/catching_basketballs_free_basketball_game.pdf
    • https://cdn.sqhk.co/xemugugafot/aGiighF/64141582558.pdf
    • https://cdn.sqhk.co/mukibusu/jj7SheQ/nizusiwinunagad.pdf
    • https://cdn.sqhk.co/zotenejek/GjbhcBo/sonopilaw.pdf
    • https://judadumoxa.weebly.com/uploads/1/3/4/7/134718892/1380719.pdf
    • https://cdn.sqhk.co/dixejetafap/icje7ji/simsimi_app_old_version.pdf
    • https://cdn.sqhk.co/woluzadeviv/zifLE24/she_wants_me_dead_gameplay.pdf
    • https://cdn.sqhk.co/xamitarerivu/7FqBzjg/infinity_pool_sales_near_me.pdf
    • http://jedilinosur.mywebcommunity.org/xafeb.pdf
    • http://rakuxijewimafud.22web.org/62879678233.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tixipisorovebog.epizy.com/6014118033.pdf
    • http://gevejonitu.onlinewebshop.net/bugodebalizisevijelelasop.pdf
    • http://minirulo.epizy.com/76733478122.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5c6.bin
60834db4991689d194716d02c6fbda3088ef871ac721db7f2d0db8177e1d0e99
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C6 5272 bytes
font_01_sfnt_off0000f7c9.bin
2803a41a6fa29bef77a48c513db618ef23289eaa7c09b38cb79d6674c9a115d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C9 10640 bytes