Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b5cd41ed0c0891…

MALICIOUS

PDF

83.8 KB Created: 2021-09-18 17:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1428d0a5590112b0b5d8c4438ae94276 SHA-1: 1033b8ae1a085903767ee51b854e22e41f7dc743 SHA-256: f8b5cd41ed0c08910ec81ba6753f751fad64464bd8205f41c4af81a4c28473bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://coretry.ru/uplcv?utm_term=cpu+of+android+phone PDF link annotation
    • https://matricula.arendic.cl/files/gexabumoxiwisusopot.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/zebodusutu.pdfIn PDF document text
    • https://nls.vn/upload/files/10360588314.pdfIn PDF document text
    • http://standardamulet.com/files/files/63533632940.pdfIn PDF document text
    • http://dogable.de/userfiles/file/45561169079.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/35391511817.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370a720500d---60263898217.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/sevamosaxalaja.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210901_080022.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/fomugevibarubabetaxin.pdfIn PDF document text
    • http://feminella.ro/upload/fck/14835200678.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/tadekefajoriretumu.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/97685535684.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/1912520344.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/83044155479.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/belopugivotizoful.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f038106447---supusepi.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/wipopabunanoleti.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/pofexoxaguwuwivifudaniwix.pdfIn PDF document text
    • https://svltv.in/userfiles/files/bazodavezakexegedukiv.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/taxededokeposowa.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/89911754590.pdfIn PDF document text
    • https://pcetravel.com/files/file/pafosikevolo.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_off0000e487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE487 17620 bytes
SHA-256: 6b57b02b43bfbd80f8566ea8c6f90f6f525d5c71ff3362fd58c294cacd71d5cb
font_01_sfnt_off0001129b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB2 10416 bytes
SHA-256: e7b698f5def1c6fd6be257d3095c98391d2579d6a937e6f222ff1e863fcd7c37

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