Malicious PDF — malware analysis report

Static analysis result for SHA-256 69cbfc5b46a7c6b8…

MALICIOUS

PDF

86.3 KB Created: 2021-09-13 13:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c51db6e0699d2cec40dcb28d6fd790d5 SHA-1: 3e0117a0f9b4e29479c101f660b3e8cb42de5f4a SHA-256: 69cbfc5b46a7c6b81426114d47cb2db335fd46643c293ff8d16924366b11d0d8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on potentially disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://placc.info/up_image/17575309721.pdf In PDF document text
    • http://yourmoneyyourbank.com/uploads/File/vorijetemosifadesoded.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/sirowitulenenugukimo.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/levijuvagedufut.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a620a24c77---delivijumegeb.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/56224482720.pdfIn PDF document text
    • https://andhimazhai.com/images/files/zefod.pdfIn PDF document text
    • http://szcftz.com/upload/kapif.pdfIn PDF document text
    • https://oferta.lt/i/File/30074669341.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/taveladopugawusopije.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/mabuxir.pdfIn PDF document text
    • http://all-premium.com/user_file/files/65841376050.pdfIn PDF document text
    • http://sun-tes.ru/files/file/74257767755.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/35488698783.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/35916045747.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea360e11e6---65144840183.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/nenisegiferewudig.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/7242316565.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/zulof.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/lonuxenomazavezexubi.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/35495051071.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/defovotarojizovebit.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/botevuratuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=android+sim+network+unlock+pinPDF 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_off0000eab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 10772 bytes
SHA-256: af3f50ea13bd5b081fb6d062299a355b2a49b0c7457bddffd94c69790b46260d
font_01_sfnt_off00010399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAB 18668 bytes
SHA-256: 9d2fa03acb69687a76c21ab2de3083036cbcf4d2fb1b03b03475b280db3a45cb

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