Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef68023090093753…

MALICIOUS

PDF

69.7 KB Created: 2021-09-30 11:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b339d1de5a40503689230c1de49b9081 SHA-1: 39b286799343fcea834042b107db2d1c4b388914 SHA-256: ef680230900937533a366396023a90d0373a172342325338b5062318e3222192
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to the document acting as a link farm, directing users to numerous distinct hosts. While no scripts were extracted, the presence of many embedded URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 5

  • 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.
  • 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://mabifitness.it/userfiles/files/bozik.pdf In PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/6211727120.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/58539494864.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/9229381600.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/48717862181.pdfIn PDF document text
    • http://btfa.tw/upload/files/boparanivaxemaro.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/67007196676.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/dafevavoxokixuwafa.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/gazobederepa.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/42470672796.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/67081254663.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/linowotutixexudiwofijag.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/18234620792.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/taperajufimepajavuv.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/dinose.pdfIn PDF document text
    • http://aurora-c.jp/files/files/gomimefoselamatejem.pdfIn PDF document text
    • https://atlantidegattico.it/file/gurumuminulidonexajar.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/3b2fcba6c2729a9a8623f46f0420b1c8/36758625582.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/6868399387.pdfIn PDF document text
    • https://afayl.com/userfiles/file/75191129547.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/84958423137.pdfIn PDF document text
    • http://newcityhk.com/userfiles/427466721.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/27354891476.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/30563528311.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/negulezusuluxinarij.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149b3ef1dd13---xugogufojali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+dying+earth+jack+vance+pdfPDF 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_off0000b3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCB 10928 bytes
SHA-256: 9ea28aba7708a9688ab2e1daac7b983f3409eee331ab2ef1260fe55432abaa32
font_02_sfnt_off0000e4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DE 14440 bytes
SHA-256: f20adc54e5ceb3e6cc011ba11beba89c2f0389124311b2e9b3e91cb9db2bbc40