Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7b73495786250a…

MALICIOUS

PDF

77.9 KB Created: 2021-09-18 20:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9c07d91768f93d6c27d98fc194a69f2c SHA-1: 7537920d3c3fe1d751121af06fad0bcbca2cfec1 SHA-256: 9b7b73495786250ae21012115825d3e3c434561e5c4df392a752b69076927bb6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs pointing to disposable hosting, suggesting an attempt to lure users to malicious sites. The document body is heavily obfuscated and contains no readable content, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://huntic.ru/uplcv?utm_term=kdrama+free+streaming+sites PDF link annotation
    • http://bytip.net/filespath/files/20210915174742.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/16714138176.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/35246562525.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/39754799344.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/nikapomitokokofolufoj.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/36603932534.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/88550050110.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/navezosilezovalir.pdfIn PDF document text
    • http://vswet.ru/f/ganawatoxapavaponapop.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/41128549757.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/3d5404b4bd58b48840b1728fab29fdbb/pobisobafivuwas.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/bexutaxamugejimur.pdfIn PDF document text
    • http://nessium.net/userfiles/file/40674595963.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/26158854995.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/34708355493.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/35218743108.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/30046554804.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/rigipupifoziguxemi.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/mewexulur.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/xadefenu.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zowunovotonazijajimikipa.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/81287571645.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/32421035194.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/donurotoxo.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/lazafirozobididepavon.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_off0000cd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD58 10524 bytes
SHA-256: bf4fdbb7ed5a46837f5673a600b122a6cb7baa9c5e9229f5749e58a5e830082d
font_01_sfnt_off0000e509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE509 17308 bytes
SHA-256: 3be21b11b48ea96d9cd0a2ee7b525da268a617c75b4122ec825745053000cf8b
font_02_sfnt_off000111fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1