Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d4c6bc45e12eb8…

MALICIOUS

PDF

70.8 KB Created: 2021-09-13 20:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0e4202de4504c5d9fafd10215471fa8d SHA-1: 3647119e34a2c91790fc9a4f5768d94af107f1c6 SHA-256: 23d4c6bc45e12eb8dbe6875ef61e09f7b852547fe154609855cd5a0654312f09
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely directing users to malicious sites. While no scripts were directly extracted, the nature of the PDF and its numerous embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://iseveranscopy.com/upload/editor/file/jilemunotajafe.pdf In PDF document text
    • https://printjet.pl/pliki_user/File/95478236305.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/girilirirupeni.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/sipavofu.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/3104885984.pdfIn PDF document text
    • http://storemisr.com/uploads/files/memex.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/fipekimukirabes.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/19178559359.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6ba6c6314---zosefijobovi.pdfIn PDF document text
    • http://ajitcoatings.com/uploads/26947614702.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/xifozodavasuwimitiv.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/derivulesufuguxedezoluse.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/6752667356.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/wokevu.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/77436588194.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/tedudimojapabobifanojufiz.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/40331670649.pdfIn PDF document text
    • https://sim2007.com/files/46528598987.pdfIn PDF document text
    • http://yibetter.com/data/files/sejejafixa.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/notikividugano.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/5bf46a6ebcf6c491de338b7de83defb5.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210907182320.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/sopigojeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=cheat+coc+unlimited+troopsPDF link annotation
    • http://www.thaiticketmajor.com/static/imgUpload/files/63747226744.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_off0000b2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DB 10912 bytes
SHA-256: 271c36d3160c455211f39fb52957b4e3feef6aadc79664374c058af4c3d7d628
font_01_sfnt_off0000cbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDC 16292 bytes
SHA-256: 0d89634a65f6fa43f09377d913d5da3929b846ba3ccfa79d0ff91c560b7b9cc9
font_02_sfnt_off0000f5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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