Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb766db3a756e30d…

MALICIOUS

PDF

68.4 KB Created: 2021-09-25 13:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ddbf6b7fcbe56bb12d748b6f73e04af6 SHA-1: 0b421185a8366d26d86da21c2b4a9787923720a6 SHA-256: bb766db3a756e30dca71b9630636ddca2e9fd8a3487d0a488102f1c40c554daa
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one with a 'utm_term' parameter suggesting a phishing or tracking lure. The PDF's structure and the presence of many distinct hosts hosting PDF files point towards a link farm used for distributing malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=live+football+tv+hd+2021+pc
    • http://teamtrinity.net/trinitya/file/tixivofenokemig.pdf
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/dorebulexepolamezozabel.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161379b518518b---pedupakutemedabonavop.pdf
    • https://granitabrasive.ro/editor_up/66951622672.pdf
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/vexafenefusakukasalaxat.pdf
    • http://tupnate.com/ckfinder/userfiles/files/99266730889.pdf
    • http://medicaldistri.com/ckfinder_files/files/tezuvusaremofuteditevi.pdf
    • https://contabil-fiscal.ro/mm/file/56281654333.pdf
    • http://sjhtractor.com/d/files/39220792696.pdf
    • http://cbafjvn.com/uploads/userfiles/file/43679466228.pdf
    • https://asken.as/bilder/file/bupinaxum.pdf
    • http://deepakbatteries.com/uploads/file/6458453997.pdf
    • http://ozhelalikram.de/resimler/files/zepopubirawe.pdf
    • http://timnhanhonline.net/upload/files/xosalalolonafagad.pdf
    • http://hyundaihungthinh.com/uploads/images/files/23787335472.pdf
    • http://learningkey.org/userfiles/70760004438.pdf
    • https://ht-cooling-j3t.com/contents/files/fivasunazepop.pdf
    • https://www.hosotte.com/ckfinder/userfiles/files/43388145859.pdf
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/72544308671.pdf
    • http://edilgroupdigiovanni.it/userfiles/files/17365981741.pdf
    • http://nguyenthaotech.com/upload/files/lotexipi.pdf
    • https://kalitelivideoizle.com/resimler/files/xoxiwabekoro.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/vutimetilovugasedumodug.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD37 16792 bytes
font_01_sfnt_off0000c54e.bin
e0c6b4dd27222b9e112ab6d384e2d57597df1c006df7c0dbe1b1fd3c8cd6e016		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC54E 10800 bytes
font_02_sfnt_off0000de28.bin
3b6f70d8d99c81226bf81ee4746cc2fb13f4b262f9eabf6bce57de2f9519e8b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE28 15144 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.