Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6975fd808c331d…

MALICIOUS

PDF

68.2 KB Created: 2021-10-03 10:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 59e274caabb08d8ad882953b39ee9b3b SHA-1: d5519051eaace4c9929af3670fa43fe47fc785da SHA-256: 9b6975fd808c331d486d6e5330990c70b2dee191f9c9c2533b83eabe62d85a8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to potentially malicious domains, suggesting it's designed to redirect users to harmful content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a large number of links on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://tuyendung.vinaonegroup.net/upload/files/86600457174.pdf In PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c992bcb8c---55455868337.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/tetizitafi.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161410ff66fab1---50946293565.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/sabisakuwodoger.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/xonam.pdfIn PDF document text
    • https://rosycaffe.com/file/82837604444.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/mexane.pdfIn PDF document text
    • https://questfran.com/broker-site/files/files/89834728125.pdfIn PDF document text
    • https://dcimx.com/files/sisafi.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/woxuzafixa.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/rofusiwu.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210924_045924.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/64168505092.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/xebejoga.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/46589033796.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/semivim.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/27263860699.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/wolagiredu.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/83763055171.pdfIn PDF document text
    • http://myslizdrave.com/soubory/91037972071.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/wafimuditegeluwewote.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/kotewozimilajevisexabarug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=restraint+meaning+in+teluguPDF 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_off0000ad59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56B 15060 bytes
SHA-256: cfe22eb9e95d7c12ae8046533566d51d268fea2a4f49c94811f53e95bed66435
font_02_sfnt_off0000ebcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCF 10476 bytes
SHA-256: 6dfab91cb4cfe722f8cbe2090c656ca2d176d81a513e2b78713eac087f668496

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