Malicious PDF — malware analysis report

Static analysis result for SHA-256 25cd2945c7acd08f…

MALICIOUS

PDF

79.7 KB Created: 2021-09-14 12:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0ef94b14ad7b03eef07d607f6352c4f3 SHA-1: 965ae901238549ea6888900119c109dce7419dfd SHA-256: 25cd2945c7acd08f4233318e3d72e59e778cc6aa2eb255f57f7ef844f7997b55
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/tumox.pdf In PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/5a6258d4b375b792fd9264f2f5944b18/poxidopaz.pdfIn PDF document text
    • https://dm288.rs/slicice/file/memaxifeleti.pdfIn PDF document text
    • http://rcot.by/pics/files/mewamapufekisusi.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/biramuxivomamezom.pdfIn PDF document text
    • http://esipro.be/userfiles/file/60171150839.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/47284866701.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1e01d40e9---70143732801.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/9427603111.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/81354151942.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/javovuvo.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/pabewaxazukogoxawok.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/13754449757.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/wuzedekororuworerifikut.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/rizijuzevojasinogumuru.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/92176869670.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/misunifuritovu.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/mutixofulev.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-03/images/files/22549411204.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/suvidokudapo.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/fakozurolikokijamonokis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+take+screenshot+on+snapchat+withoutPDF 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_off0000d2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F5 17524 bytes
SHA-256: 424a65672470c758006b17d5df801072b89351feb073ac0baca9c300fb54c5bc
font_01_sfnt_off0001008f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A6 10692 bytes
SHA-256: f5924678c7a41553473a6c2451674d08c32e884d75ebf1ad21ff1020549c80b2

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