Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a2bcbe37f71e52…

MALICIOUS

PDF

83.2 KB Created: 2021-09-23 10:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: adf680caf6364b392a56327ea4b7a91c SHA-1: b6ad2880f2673f6a7c36deb3fcb7b162f77c13aa SHA-256: 85a2bcbe37f71e52045949fbdf6f4f9c12abf85c90ff873015fba6741b7db62c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, with heuristics indicating it functions as a link farm on disposable hosting. The ClamAV detection and ML classifier flagging strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5104

Heuristics 4

  • 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
  • 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://chcial.ru/uplcv?utm_term=aplikasi+edit+foto+bergerak+yang+lagi+viral PDF link annotation
    • http://topliving.sk/userfiles/file/93050107804.pdfIn PDF document text
    • https://hoavily.com/uploads/files/lusaladazorupezitelinowul.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b4a61a05f---sabisig.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/kipalumewewudafezitel.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/zabetifumorapemijix.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/84021417627.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/kogamefizaxuziniroxoxikuk.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/muwogitaderiw.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/55145563076.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/visaxusiwitesitovid.pdfIn PDF document text
    • http://cncsprings.com/d/files/17994577625.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/zegobubabevax.pdfIn PDF document text
    • https://partnermind.cz/images/files/kosenetukejozejebage.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/jatodez.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/gagofekumumeguveberuv.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/luragebalugi.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613568be96131---zukutufef.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/renodokubitejipujate.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/26076952460.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/30966094138.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/wazusuvulag.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/34177776100.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/figirepemezudeda.pdfIn PDF document text
    • https://ibericadearmerias.com/file/20176284847.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/89685111376.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CD 16848 bytes
SHA-256: 1cfb079db1fe5170f16bc16ea01d8fbeab189ca7c6e2f6d472ecc09e63d807f8

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