Malicious PDF — malware analysis report

Static analysis result for SHA-256 a972e18d61a428b3…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 00:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1ecfa654fb14501b088b91e958776692 SHA-1: cdf8482bbdb82b4a85464d58f9ed95cdd8ecd981 SHA-256: a972e18d61a428b32b2ca85a079079ff26ac46eece26d8e5a1ef72f256711b58
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest the PDF's primary function is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://pixomot.ru/uplcv?utm_term=traductor+ingles+espa%C3%B1ol+apk+full PDF link annotation
    • http://jaluzipro.ru/public/userfiles/file/15898492494.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/netowolub.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/setagipodesa.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/gugobumovoxowawogunejuso.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/90264551716.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/76439635416.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/61960643609.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/12865661163.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/38497997062.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/nasixoxowan.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/xepeserafaronaje.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/pulutasepavujodufulegike.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/fijadikiriverepemuwe.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/23008708203.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/kifinarobeku.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/0lg9fce7rbvqb7bevq0ngu96l1/40442052018.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109072204297269.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/38339355850.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/deposupajavojozi.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/nagularatumemeruditasiv.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b4bc0865c---nabubugumifaxotitidu.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/89256202021.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/gegexadowafazigebupazote.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/ronididif.pdfIn PDF document text
    • 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_off0000d229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3B 19500 bytes
SHA-256: a2846a0395cc111995245f436f240d0b4f4eb6ffb35af33625490819c9396298
font_02_sfnt_off00011c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5A 11156 bytes
SHA-256: 0267b2d2ead3e4fdc42124975184cfa65881ff53b6b5169adc0da2071c27a470