Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4c130ee4a3e210…

MALICIOUS

PDF

86.4 KB Created: 2021-09-18 12:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c5c728e347ec51d501c0fe49cf9dcc5 SHA-1: 7e7e7420cf788f861e3427506863de196743e097 SHA-256: ae4c130ee4a3e2103eb0024ba898ae35ef5e890adb286aa6af72db8b24eec1ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest the document's primary purpose is to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the nature of PDF malware often involves embedded JavaScript for obfuscation or redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://gz-theoutfit.com/UploadFiles/FCKeditor/20210903103048.pdf In PDF document text
    • http://dongtienlamnghiep.com/upload/file/lijowawijorigonuxusok.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/budogizigufubaketon.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/jamazufivatekujudigefe.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/xuralefetoni.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/60131276595.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/vulidajixirajozetix.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/waxibikukozapib.pdfIn PDF document text
    • http://sanruouvang.net/images/uploaded/file/77947929224.pdfIn PDF document text
    • http://dkind.net/userData/board/file/10431933806.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/46731622054.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141117a3e2fe---mivasojizis.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9c7193b01---nafevujagofilaneber.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/gogovupibotul.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/gulasepugoxewifofejobubo.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/voravas.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/88606539731.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/vepikake.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/40883670875.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///wixeledoninufas.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/saged.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=iphone+emulator+on+windows+10PDF 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_off0000eae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE3 18540 bytes
SHA-256: 5b8c72cd3e69dd5acc252e38ec7c25852243b921ccc88a6f53a4e3880fd8ac43
font_01_sfnt_off00011aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C5 10968 bytes
SHA-256: fb22c1fdafe6859b0b9e6582eb81d2cd5ad331eed2e73a8d1f9588fcaa4a16a1

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