Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85ce09d30f7990e…

MALICIOUS

PDF

82.6 KB Created: 2021-09-14 06:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f8be4964c8706ac5b1e4808c3a19728d SHA-1: ea9c7bb4302d019c19571d5ca913d45b5ec4d2b0 SHA-256: b85ce09d30f7990ec3b635581d09f4234dbb7f108af2655dcbc0204c7a2095f9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external links, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=sao+alicization+war+of+underworld+part+2+dub PDF link annotation
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210905183300.pdfIn PDF document text
    • http://tencanpowder.com/d/files/ziwofozisixanowo.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/32641446666.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/23626730329.pdfIn PDF document text
    • https://riwg.in/userfiles/file/tibaxalolubajikarew.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/lakam.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/bavapaxaxonofenuzavise.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/muvubemunegukazeke.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/diwovogiturupabejupu.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/55221850163.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/boxavizidabeweriwuxov.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/mivezodetelusule.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/59758126963.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/55557367837.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/zibudexirotinikisabobe.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/jekofifadawujararusuja.pdfIn PDF document text
    • http://hidropro.hu/upload/desegiminoguvagotovazupas.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef9183cf8d---93002824614.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/92374740845.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/rubetoxuxi.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/gavukudo.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/zadexurifew.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/pivuko.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_off0000dca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA0 11028 bytes
SHA-256: e3b219a1c3f78737f72b9bd3bfcb30b936f413f7240195bfa1e26449dcadc879
font_01_sfnt_off0000f656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF656 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E68 17796 bytes
SHA-256: 3646efa380e3235b116d9ba94d959296bbeeaef72771eab49ee048941b3fb0e0

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