Malicious PDF — malware analysis report

Static analysis result for SHA-256 874c1f11c33cb39e…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 10:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5a51643dc957551484883d690a2c47e SHA-1: 9f44c73abd4007cbdcd69ad7a58e59f145a1e750 SHA-256: 874c1f11c33cb39ea37fa631cc74d33521f02d5322fbe37842a92c022a8e2be3
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, suggesting a link farm or distribution network. The presence of external URIs and the overall detection as a phishing/trojan PDF indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://24horasnoar.com.br/ckfinder/userfiles/files/rajavageriwijibikuxexen.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614122a6e8054---jebowa.pdf
    • https://gestcargo.com/uploadfiles/file/38650603248.pdf
    • https://ww150006.linebot.net/upfile/files/20210916155222.pdf
    • http://pokemom2.com/uploads/files/15279505299.pdf
    • http://simkoongschool.com/uploads/editer/files/44667867485.pdf
    • http://cansuyu.org/resimler/files/sexuwuj.pdf
    • http://daoltrading.com/userData/board/file/xoluxoloruxabo.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136f4c251de5---74074974487.pdf
    • https://abandassociates.com/ckfinder/userfiles/files/51269799665.pdf
    • https://profitaler.com/UserFiles/file/89873776271.pdf
    • https://raiporjai.com/piceditor/file/94255515450.pdf
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/furikeleralose.pdf
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/wogewemerurijad.pdf
    • https://generalaudit.pl/eurostyl/photos/file/gapororiv.pdf
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/49782075009.pdf
    • http://kozelsk-adm.ru/files/uploads/files/14263701313.pdf
    • http://gidromall.ru/img/uploads/file/xezemupipasowura.pdf
    • https://khmernative-rice.com/userfiles/file/76534665157.pdf
    • http://deaprogettazioni.it/userfiles/files/rizoputegaxewul.pdf
    • https://incense888.com/uploads/files/202109041256582971.pdf
    • http://studioschicchi.eu/userfiles/files/fapipemizijusodafezafop.pdf
    • https://marcvandewiele.com/userfiles/file/96488059321.pdf
    • http://libron.pl/fckupload/assets/file/pefurajelanalid.pdf
    • https://novamakine.com/upload/ckfinder/files/13502405357.pdf
    • https://muzeumkonstancina.pl/attachments/file/kuduzog.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=shift+apps+to+sd+card
    • 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_off0000d8d2.bin
6ede0f5ae4cfb8358394365e60e21b85a6b648bfe72d096845ddec92943a7531		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D2 18920 bytes
font_01_sfnt_off00010a6d.bin
42fb5fc27bc9430be4206e7c355946dfcd432d83b29ea5dccc5d761a0ac6eb74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6D 10512 bytes
font_02_sfnt_off00012273.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12273 16792 bytes

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