Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5e2f6d5b02be7f…

MALICIOUS

PDF

85.8 KB Created: 2021-09-19 17:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8166fac7929b5af8955d5bd55e00d323 SHA-1: d21ef0155fa8f2b439cef669be503b2640a2a89d SHA-256: 5e5e2f6d5b02be7fdb537a54f57f719c89f5ae63c6ebcf148eab50cb37ff8f22
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://issaproject.com/app/views/panel/ckfinder/userfiles/files/gudaf.pdf In PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/12244789758.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/wuserubobopojugagirasatut.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/luvetatonana.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/43556367554.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/4068044852.pdfIn PDF document text
    • http://hexindechem.com/upload/files/5605734134.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/kosiwagetulen.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/vigizowelibaseboxa.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/zoxuwevim.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/penivunuxelevofuvokewoka.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/gosixubokoposev.pdfIn PDF document text
    • https://kultmotor.hu/images/files/68967540626.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/20568708962.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/pimujudebugogipelobajik.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a6d49bfce---moxinerinipajixiviz.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/90023493330.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/52267154324.pdfIn PDF document text
    • https://tipresentoio.it/images/file/92199348393.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/zutuxubavasozukuvogevapo.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/lipelurenesedisonukebewu.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/94040383077.pdfIn PDF document text
    • https://dabanbep.tanglehadong.com/upload/files/2049286094.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/22086642426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=free+android+game+sPDF 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_off0000eb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB05 18236 bytes
SHA-256: 2a942333aa3f0cfe61a3978749bfc80a5a8552da03cfeaa125fb6db011381cb5
font_01_sfnt_off00011a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13254 10424 bytes
SHA-256: f6fc0694011916e1846c75e09d34a7e62b9f15b8cbb155a482b2d36ab756092d