Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e7e66e1d9a6648…

MALICIOUS

PDF

80.4 KB Created: 2021-09-14 06:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f01bef99a2e2a4abf474d5a26e9d2e6 SHA-1: 9466b12a6b4b7eb8a418e3998f1a222061b6d2e2 SHA-256: c9e7e66e1d9a6648ace37918e604b55ad3f1d51ee6cbcd3f7cc7184bf49225ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that point to a link farm, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts, reinforcing the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://zhizhencn.com/filespath/files/20210911073421.pdf In PDF document text
    • http://phuocthuan.vn/images/pic/file/gisavanarod.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/51483609047.pdfIn PDF document text
    • http://sgpeo.pl/users/file/65257667843.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb7f99f2a1---didujejipavipizoteviz.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/28651841398.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/xosigojavugajefurujaku.pdfIn PDF document text
    • http://jfe.hk/userfiles/19871794855.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/fezikimanos.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/wetituga.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/wuronabupirutaxemije.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/sonelakurokumezegap.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/28125401421.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/xesaxazelodudomuj.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/12342070643.pdfIn PDF document text
    • http://sinoorchids.com/image/file/65187748669.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/zazopekuruxoxetori.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/90805975419.pdfIn PDF document text
    • http://futboltotal.net/images/files/54480402207.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/94068094887.pdfIn PDF document text
    • http://kammed.com/userfiles/file/77714093508.pdfIn PDF document text
    • https://iohrp.org/f_files/files/telalaben.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109101054162027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+disable+android+system+notificationPDF 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_off0000d4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A4 10968 bytes
SHA-256: 2b1c57fea2d0958b23371619747cc2bff4d058b8c353ce56c0260c49099f1253
font_01_sfnt_off0000ee1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1D 17608 bytes
SHA-256: 6a957a9270dba48f4ebdf090ebdeb29e16275bc6abb65e104328011542b9eaad
font_02_sfnt_off00011bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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