Malicious PDF — malware analysis report

Static analysis result for SHA-256 932a7de89f7eeaf4…

MALICIOUS

PDF

83.1 KB Created: 2021-10-09 07:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f99fb8fbffb9153c4d95a4ec7eedf0fa SHA-1: 47cf8b38bd9cb536702cfcc785e4dd926a3214e2 SHA-256: 932a7de89f7eeaf4f68eb195027cb3fdb9954eb7feb80d91a35ee329d353cfb1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://angel-conference.org/upload_fck/file/2021-9-12/20210912222632957586.pdf In PDF document text
    • http://merlegdoktor.hu/tmp/45422979361.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e1548211d5---nurafexudur.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/24157531332.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/20048958069.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/namun.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/kubidokapifapu.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/xilagevixezalazifakizegep.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/5280617274.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/nafifitematatawup.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/39161720241.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/64330335906.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/77671043045.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/zowumunara.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/tirawed.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/98664632131.pdfIn PDF document text
    • http://93564497.com/userfiles/ganorugojo.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/gobukafofuj.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/86426628205.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/24191004593.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16160d4f6695ce---96726787697.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20211001_E8AA2A341C5622E6.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210928_CBF67A38EF8B8140.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/mexawateb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=128+as+a+product+of+prime+factorsPDF 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_off0000d9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D1 11016 bytes
SHA-256: 8ecb566f086fad4e71907bdb66efc2e5f9230078f67a8d2d2cddf20b6a99c0ee
font_01_sfnt_off0000f38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38F 19412 bytes
SHA-256: 372dd7489d5fb0eb237d0adcf4a7195890e13fc687e1544fceb9a0b89a24049d
font_02_sfnt_off00012668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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