Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a47a62f1fb01ca2…

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 06:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a66c0811484dc2307ba97990fe883675 SHA-1: b183cc733b5b8d0635707c319d343ce034217d68 SHA-256: 8a47a62f1fb01ca2e3b4cddf85f557ca529af51d9f824be8eb187092c3f65d06
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as phishing-related. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The presence of external URIs and the overall structure suggest an attempt to redirect users to potentially harmful content or for SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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
  • 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://ibarugi.com/fckeditor/userfiles/file/33510645205.pdf In PDF document text
    • http://4yoga.by/pics/files/monigabedemupotubitim.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/57669793027.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/xozotikudimovimeg.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/27393322294.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/bugexekanoxafak.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/legewup.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/kidiromoduxodamivijo.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/11088102437.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/meruzubadabenajel.pdfIn PDF document text
    • https://protraderin.com/userfiles/file/jalopetuwokugaz.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/a2e9e9568cbe091936a391612994f459/84996483475.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/bimowewovik.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/80488836176.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/mekujunupiwolud.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/xuleborurivozugomamit.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/vozevijojonubunekebevigiz.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135118a201c3---66782514262.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/foripiworukagumox.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/69964517682.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/jafavikekek.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210910075501592764506.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/xebabegonobakovajozobaled.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=credit+card+generator+with+cscPDF 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_off0000dc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC22 10720 bytes
SHA-256: 56fda8b20f415e12e08e7dd7ef9b006f0713cefdb2b5cf9eee7f3dc8cce15d2d
font_01_sfnt_off0000f492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 17636 bytes
SHA-256: e98a85e6b1ef70d08a508bd266850b6d2bbb1360b016084308b3d0fcd498530c
font_02_sfnt_off0001228e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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