Malicious PDF — malware analysis report

Static analysis result for SHA-256 4640a4cd196c589e…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 11:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ec38a320cfd676aa4a3257ed84fdfaca SHA-1: 2384266d18949d84c56e3357d8fbc5847f6229a1 SHA-256: 4640a4cd196c589eb3ad9acf50b0e5c6391c14210551bfe4f02b1afda75e54b8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one specifically prompting the user to 'enable flash player'. This suggests a social engineering tactic to trick the user into navigating to a potentially malicious website. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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://smidgel.ru/uplcv?utm_term=enable+flash+player+in+chrome+android PDF link annotation
    • http://goldendazzle.com/upload/quangtri/files/87249425365.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/jagesojajemezeramufaxi.pdfIn PDF document text
    • http://linza-market.ru/upload/files/mekazivasekegejapofu.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/sojagavidurajarotixem.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/16431355862.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/41980805654.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/kogopexitusisuzusuxo.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaefa8b566---nutopelavuxekapuka.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/19381696817.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/zararazegotokofujal.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6456845ab---fobexugojex.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/43361283794.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/46510145588.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/zatuvulokomalanudawutorot.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/56855637378.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/58188786388.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/luzexupukajesudasapojeta.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/38495990285.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/82201438249.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19846191275.pdfIn PDF document text
    • http://sinostandards.net/upload/files/kiboxed.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/93803504232.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_off0000dcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF501 17996 bytes
SHA-256: f2d6f74a4925ceb768458fddf50bebbc8767de378fa6e68070add86a8d426aa8
font_02_sfnt_off0001231d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231D 11024 bytes
SHA-256: c3bdb03ccb635b3c99f299904c18def18cfc312323564a2d90582b98b30d4d94

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