Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8a9e202f4a9224…

MALICIOUS

PDF

77.7 KB Created: 2021-09-10 09:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 92bdc5e33fcfa9c47463d37d29fea307 SHA-1: b29c90cd002642836ac3875c3d52f7945ab84188 SHA-256: bc8a9e202f4a92241c877238d01e9553a43d40bd1e5c4a601612e1a3b770eac5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://huntic.ru/uplcv?utm_term=download+world+bus+driving+simulator+mod+apk PDF link annotation
    • https://quanghuydulich.vn/img_duhoc/files/mikazovuzugixofikino.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/15925818357.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/bopugosok.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/88604712816.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/67672078280.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210907_9098A2DE2E0C7845.pdfIn PDF document text
    • http://air-con.ru/upload/files/gugomigaxavomonaja.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/bowuratuzap.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/21326860793.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613726c9d16da---28261968897.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/32324161726.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/rofevenamu.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/32721988397.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/63726580982.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/86415872501.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/tulikikupori.pdfIn PDF document text
    • http://ellev.fr/upload/files/sifegiguxexivuferepe.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/fewavojuratozovusugalub.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/17809988164.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/ziganizezifabanitotobilo.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/50250249652.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/77747827802.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/70437074529.pdfIn PDF document text
    • 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_off0000ca23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE235 17536 bytes
SHA-256: e252de0f062cdbcc3ff39fdbedb75ac63435b00d0b17da5808e4719e1fe408cb
font_02_sfnt_off00010f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F96 11088 bytes
SHA-256: b14594be37c81c03bf3995e619f69d3de2d90834a753aeacb161a5511728ef37

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