Malicious PDF — malware analysis report

Static analysis result for SHA-256 045eff7413cce2a6…

MALICIOUS

PDF

79.9 KB Created: 2021-10-10 08:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4b31b81d2e7b9927e0a5245c978afc40 SHA-1: 248f6bd55a3f6f1f3d14104a11c0648695a719ac SHA-256: 045eff7413cce2a6432f54bb64898e6264aa8de53b6d1ed9e3b9e6188ed54f31
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the document is designed to lure users to potentially malicious sites. The embedded JavaScript is a strong indicator of malicious intent, likely to facilitate further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=wether+10+days PDF link annotation
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/4bf2h4u2svhknt3u9no5rlmf88/kegulerabutafukokokujag.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109091818494942.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/17411140645.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/sogububov.pdfIn PDF document text
    • http://dnepropress.net/files/file/29636143258.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/69479517979.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/zezerogivez.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/vekizijomitedi.pdfIn PDF document text
    • http://hnyinfeng.com/d/files/36413024598.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/zegef.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/sinefujawupurufikozeni.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/4896585053.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/wedexofaxomulebavepe.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/67657506562.pdfIn PDF document text
    • http://telangana99.com/userfiles/file/76496862304.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021100909494973499.pdfIn PDF document text
    • http://hun777.hu/_user/file/61180780682.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/mexaruda.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/36368763178.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/wugagoduza.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133a42577b4d---92838018460.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/39859530610.pdfIn PDF document text
    • https://thermaltrailrace.com/imagini_ws/kinumifo.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/61582160727.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/98251162415.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_off0000d47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47C 10264 bytes
SHA-256: 3be008ac1f90021e3a1f24f8a779da53fdbe81025628774b7c3d2c5831bd8ba0
font_01_sfnt_off0000ebda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDA 17776 bytes
SHA-256: a16e0d55ffe9e1e7ce150135d9ea691cc7b8deef5e5111b86b3569aac555b70a
font_02_sfnt_off00011a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1