Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf622c63a1db604…

MALICIOUS

PDF

93.9 KB Created: 2021-09-23 10:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9a99316320e30637059718bfcba85f91 SHA-1: f7590fde9b9074a8aeadf849dc0b93619bea9b05 SHA-256: 8cf622c63a1db60478a72d5b0097a0ec2971e4d83e426702edd9ac88d3a1f102
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure itself is also flagged for containing external URIs and being a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://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://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_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
font_02_sfnt_off00014fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD2 11068 bytes
SHA-256: e04964f3d70edfba602a6b2cf10b1d7e19035801a2ea96770db56729db0892a2