Malicious PDF — malware analysis report

Static analysis result for SHA-256 3658fbe5ad3e8a55…

MALICIOUS

PDF

74.6 KB Created: 2021-09-10 23:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3840ace94ffb79915611df421ad27449 SHA-1: 481099e77e0d38652d79485922c19a3e6e67dd62 SHA-256: 3658fbe5ad3e8a559e986bc169087e241fafa55ec39e9c066505322cecdc74cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are likely used to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a link farm designed for SEO manipulation or to host malicious content. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://md-bud.pl/szklo/photos/file/ferowamasa.pdf In PDF document text
    • http://etalentlink.com/uploadfile/file///2021091021174689.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/50845734148.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/26621838819.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/lirasubobuteranidumakobig.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/wajolisuvirejomono.pdfIn PDF document text
    • https://jobtiara.com/files/files/66240097903.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/kogowewuzuboduzadunu.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/55280976701.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/wodijetasuf.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613177dbb285b---laxofujalorakurogafawese.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/tifutos.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/doxuredodovaridatejaxogo.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/47962789694.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/nojujisipodokolewijufas.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/92236330505.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/duditafesavutiredizegox.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/tusojovudez.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/26938579607.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/43299048604.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/26491151318.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/93268200091.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/wobudezos.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161315f9e41068---43385925637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mi+a3+android+11+update+problem+solutionPDF 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_off0000bf27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF27 17100 bytes
SHA-256: b08fc934745af62d6d95925b6bfc1f5d78e73d5d513f7eb8df6e6ce5108cd9ec
font_01_sfnt_off0000eb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB52 11008 bytes
SHA-256: 9c2b81165d78062a6d84dd0267ece5588ef05a19345727128f0d2cd5997826e6
font_02_sfnt_off000104b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1