Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf2a769fd563f5c…

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 13:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a3147787fa6f299f8c02dc6bac03f1b8 SHA-1: 4f116a531ca0f2f201682b93fd3e83be494c64f6 SHA-256: 8bf2a769fd563f5ce92c1983eff785486374142e4114f779a70d5989b88a23fe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://philabc.ru/uplcv?utm_term=space+decor+dream+home+design+apk PDF link annotation
    • https://www.cygnusdvlp.in/nitdurgapur/uploads/editorUploads/userfiles/files/1788011568.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/55356687645.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/zisakutidebifivelulivut.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210905_2A8C2DE99FD63C43.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/nigumogatak.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/26461137637.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/liwoxokusilapamurufe.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/57093613653.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/belilasefizefujazudijibem.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/45861018248.pdfIn PDF document text
    • https://khanikango.in/file/sorakesuwejiwe.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/lonisumizefosirez.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/mawemolosij.pdfIn PDF document text
    • http://santeh.md/img/files/nibagezakuwimitagav.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/siviz.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/96544021021.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133101f2d0e5---75879304399.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/bupexuwu.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/rojuvix.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/23709612579.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/dukezuj.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20219242122.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_off0000db5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5E 10984 bytes
SHA-256: d2ef5aa7d680ff7d87aaa93912cbde7869bea32580d582764d74661a8c47fa5e
font_01_sfnt_off0000f468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7A 17672 bytes
SHA-256: 7b96eeef43e439a3101eb4018e98defef02979713791e574e5ed69954858a861

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