Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2f97983970e75c…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 19:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 003e3d6168c1da295f428c7e2c0143cd SHA-1: ba6fbaae7e1018727246365c026043d00c0fe490 SHA-256: 5d2f97983970e75c5a8ad522bc5fc8b627488b77af906860026939778334baac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly suggest a phishing or malware distribution attempt.

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://smidgel.ru/uplcv?utm_term=special+force+m+remastered+apk+download PDF link annotation
    • https://fzclicks.com/demo/files/editor/file/jorexonopuxobusalejujanu.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210906_CC7E3BC208EA64FF.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/43763788159.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/siwadobetanodevopabonif.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/muridokuruwanisolopixod.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/gunasomedukibivefup.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/wuxapejubanasesox.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/woxurova.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/tapaxirovem.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/tawesowupabolajevijis.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef372a5559---49342640680.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/88500085644.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/lomijijozuzofosifot.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/wutajuvomoxewadefovegaw.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/77140534403.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/jejumizukepubutimirutevi.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/jopebobojuvimive.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/foderitaj.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/27337140936.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/zevuluvoto.pdfIn PDF document text
    • http://timocomputer.cz/files/file/dajajekepofitu.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/selejodinejadikafimad.pdfIn PDF document text
    • http://sinoorchids.com/image/file/83882657743.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/bk7c1smsd41vofsmq99p99lcb5/ruvugugajum.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_off0000da9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9D 19008 bytes
SHA-256: e65acedd362f418679c127ef98cb93a4127bc385b825c548820641434db08eb7
font_01_sfnt_off00010cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D6 11032 bytes
SHA-256: 0b7440172562ea3ae92915437d5ec22a5645351057931436359ee51598ec2cf4