Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec990b93ca5e1aa…

MALICIOUS

PDF

75.5 KB Created: 2021-09-18 13:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 581d7a57a7bc4573ca909d8d4e8300ea SHA-1: 529bcab29d5f5deb6226008e800d61aa205f7b91 SHA-256: dec990b93ca5e1aa9b9d7449136bb99d490fc385f8fa7849a12cf8170e2ef441
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious content or are part of a link farm, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dacaea3bcf---dufasefuposujujoveze.pdf In PDF document text
    • https://adesso-moosburg.de/images/file/riwerawadeguk.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/goxokegodiwati.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/72616490659.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/movofuwibuwivalawunivava.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/83078775223.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/64808653004.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/8148623812.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/menanagibezipevevubibibid.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/kasaxosobabalek.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/gutiminagisedidagakan.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/papumovatepetowotutin.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/89901939843.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/zulimugusodowulepumin.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/05/17213612284.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/nojedumawibopemamikakox.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/fafobibe.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/wukawijijedidunalezenax.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/26167048677.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/tenupatirabinulujifugor.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/sowawesosinuwive.pdfIn PDF document text
    • http://merwepizza.com/upload/file/67756076698.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/nufuturusezorilijes.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210906162052.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/lisomib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=daily+iptv+list+apkPDF 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_off0000c2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A9 17992 bytes
SHA-256: 384409a0597e29cd57b294fe71fe75f270f8867a024d04fabd1e0d8ee0dfca9d
font_01_sfnt_off0000f19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19F 10064 bytes
SHA-256: db4895f5aabf1f7a89ef4fcbccde0f5e7ed6e558dfc23bc2f9f47cb8513f8e46
font_02_sfnt_off0001082d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1