Malicious PDF — malware analysis report

Static analysis result for SHA-256 961ffcc617d4979f…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 22:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 73069bd63922e25dcce9daa7eb39558a SHA-1: 8e28df0f974a269dd9648aff5fafb82fc8a1bbba SHA-256: 961ffcc617d4979fed34ee7bb1f659f9f95ca0cc2238ae5bf9ada9c57beab2b4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, a common tactic for phishing or directing users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no explicit script was found to be executable, the PDF structure and embedded URIs suggest it's designed to redirect users, potentially leading to a second-stage download or credential harvesting.

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://konferencii.ru/js/ckfinder/userfiles/files/degubalama.pdf In PDF document text
    • http://german-ex.com/images/blog/file/80566129004.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/zuwezuset.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/niratitagumutafimetib.pdfIn PDF document text
    • http://reichspfarrer.sk/file/68509461362.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/maxadogotiwig.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/zigulivudovunukijij.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/nejenojuleteluz.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/rapiliw.pdfIn PDF document text
    • http://trieuduong.com/images/Download/11683217060.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/xifavagatuja.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/nevupibetefuda.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/dejozum.pdfIn PDF document text
    • http://medicareclinichowrah.net/faboriginelist-braj/userfiles/file/88645502339.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/36078684584.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/vuxisiwejeboka.pdfIn PDF document text
    • http://gibisch.info/files/files/73954397888.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/34412713871.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/27923551198.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/91974279f0ce521715d67ee16d9a88b6/lujexosegigexo.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/gebuzetotul.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/34922622207.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16144f84793499---80164747348.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/zurepipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=submarine+game+for+androidPDF 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_off0000af5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5A 10700 bytes
SHA-256: 36018d833421c74592795f7cbe2d4afd084766c7fb77cc8ebfe83fe026f98d53
font_01_sfnt_off0000c79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79F 16788 bytes
SHA-256: 3910e0743fe7cc1e27c594e2518d76f17d549a11d6495a8e41ddb0bf62101865
font_02_sfnt_off0000f208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF208 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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