Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4dd2fdb8f51094f…

MALICIOUS

PDF

69.2 KB Created: 2021-09-17 19:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d877d0ec817321137a4b6a9ea8dbe4fc SHA-1: 21cfc65d11cdc2a8ac78b7ec0d45c63651622d39 SHA-256: e4dd2fdb8f51094fafbbe0cd3410120e57e84480cbb13ea5ba8c944280e21df5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or credential harvesting campaign. The PDF structure and embedded links are characteristic of a link farm used to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ailizia.com/userfiles/sikarejekasokobi.pdf In PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/libimir.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/mujusapatuxuzerawezagasuk.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/26162746041.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/92565885637.pdfIn PDF document text
    • https://tipresentoio.it/images/file/65691875747.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/bisanupusiwomivim.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210917_5AEEE478D746F0FB.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/95736913711.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/bagowiwasalewikinebuvat.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/86027673907.pdfIn PDF document text
    • http://strihaci.cz/userfiles/file/50318239715.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/20290845379.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/ruseririxubolakam.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/muwewaxibazi.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c7fba3b5c---27959638652.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/wodefipobezedumadevaw.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/52468115519.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/81720737155.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/makumudowubigalelibosevis.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/tatamun.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a16241eb52---99244670238.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/70555776256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=partial+derivative+of+ePDF 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_off0000b2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C4 10140 bytes
SHA-256: b99dcc34ba5b8e176cb6184c453c1da2d2182f342cc69b94bdaa065161164c3b
font_01_sfnt_off0000c984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC984 14960 bytes
SHA-256: 24d9f40de24343f5660b6424eabfd239f28ff534d1c5541b732d3c75d017096f
font_02_sfnt_off0000ef2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1