Malicious PDF — malware analysis report

Static analysis result for SHA-256 fee6da8a516b9d37…

MALICIOUS

PDF

76.3 KB Created: 2021-09-08 18:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f795f4df38d7ade91a8ee55b1409b502 SHA-1: fe440ecdb790c60cefdf477f8b506c44af6bb98a SHA-256: fee6da8a516b9d37df6d3dc062e1a79682117a4e6827f222b912d8a254b801b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it is a link farm. The embedded URLs point to various domains hosting PDF files, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the nature of the link farm and the ML detection strongly suggest malicious intent, likely involving the redirection of users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://mgrima.com/files/file/13297119950.pdf In PDF document text
    • http://reelproductionshd.com/userfiles/file/janoxuzezigikakisekor.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/majunikulunuga.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/61660944408.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/97083685763.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/34322214433.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161319a80e3bad---61415582219.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131723c74f3f---5108556280.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109071417139180.pdfIn PDF document text
    • http://nktrading.qa/file/files/naxunawunidufev.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/nenub.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343d13bb816---fijerob.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/gezinobuwusikimosulenugar.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/6557057361.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/76846826303.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/zigudado.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/sinarupujiwovivug.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/bovefaxovu.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/48457733948.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/1715680385.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/012304489070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=acgih+tlv+2019+pdfPDF 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_off0000c465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC465 10620 bytes
SHA-256: a9a8146bdb98f5fe961b8a78ca016ad3de8acbee17299a14a780fb7b117f42de
font_01_sfnt_off0000dcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAB 17908 bytes
SHA-256: 366b7f2e683ed2573d6ca97f40eedf77fcf337bcce6892a1a71e26517d7f0eac
font_02_sfnt_off00010ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1