Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58ea22286720bba…

MALICIOUS

PDF

72.6 KB Created: 2021-09-26 00:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2405986dc70f5fce58ee61596830ab29 SHA-1: 9dda2aa4acfa522f99d8ce41d80677ca2bcf529b SHA-256: e58ea22286720bba34c09d62114aaa910d2bb018faffe5d8f741a16b8badad06
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF viewers or redirecting users. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://bandloc.com/FCKeditor/file/korali.pdf In PDF document text
    • https://momentous-inst.com/uploads/image/files/10899798095.pdfIn PDF document text
    • http://suaups.net/userfiles/file/66219402331.pdfIn PDF document text
    • https://10fci.org/userfiles/file/7160549998.pdfIn PDF document text
    • http://ipceurope.com/assets/file/93161442999.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/f24fpgg8jmedmjku6kc7rdli01/wogenepazesepejuzodigapip.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/3956735735.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/60770962544.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/79731427888.pdfIn PDF document text
    • http://asvpp.fr/pdf/10518526720.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/nusokojoxovosilitek.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/17969406840.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/zufomapetalotepiwiwugi.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/winotumo.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/sesozubosadokiv.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/dutusatejotabezudisigabo.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/dujegowazusefosugevo.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/fepobejazava.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/dodigogimigad.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/25716750679.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/vipovifazedodiduri.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/nanidekobuxodakavevaz.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/kemijetezuxapapizidelegom.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/10956bff84d96f6f2155134eba2e7001/90602842335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=camera+scanner+android+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_off0000b521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB521 18528 bytes
SHA-256: f27d4ab7b216f562dc0b1f6753fa7bf0ceb5443e8032554064818447ff40e933
font_01_sfnt_off0000e4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCD 10564 bytes
SHA-256: 42e621bacb5640b39b3c92573440f8ff6060ea5760d03418cead325abfb7be8f