Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd1ef3b418cd46c…

MALICIOUS

PDF

101.3 KB Created: 2021-09-23 00:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bf8cdc2d29160ea72c1ea34c454ae79f SHA-1: 96854e58b6558a919fdc514acb34085bf9210b60 SHA-256: 7cd1ef3b418cd46c323a437f1f12026529afd93cf803b4e6317a468e1932da6c
94 Risk Score

Malware Insights

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

The PDF was detected as a phishing trojan by ClamAV, and static analysis revealed it functions as a link farm with numerous external URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links to distinct, potentially disposable hosts, suggesting an attempt to lure users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier clean score 0.1206

Heuristics 4

  • 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
  • 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://steelfurniturecn.com/d/files/niwifibiwedujofazunum.pdf In PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4c1fbc93e---33750290172.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/dezazinuralazebedib.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/38481122035.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/taridalubekero.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/72357888373.pdfIn PDF document text
    • https://biocoils.com/img/file/fizavoniwawajufule.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16132f1bc8a62b---45428689166.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/77082142674.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109100938491414.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/bezudor.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/55136776875.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/79371005775.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/palab.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/12719101779.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/25958873236.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/40781893943.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/fbda143daf1b00d178def67d21de35d9/2148590428.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/xatomadoj.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/8779864184.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-17-09-55-53-On6yP7XZ.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/zized.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/torewakavusetava.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/42496183815.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/43141153692.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/lexizas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=vishnu+sahasranamam+lyrics+in+englishPDF link annotation
    • 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_off0001352d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352D 21172 bytes
SHA-256: 4c58df6d778390f2012e7ac5e960cfc04bf32836b47762be59e265680828fb25
font_01_sfnt_off00016aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AA1 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137
font_02_sfnt_off00018019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18019 10644 bytes
SHA-256: 1ce5f3b0cb1e637601c0274d4b7ae0ed44ff49bd7bebc8d5b6762abd2468bf5c

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