Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9587c485c52e08…

MALICIOUS

PDF

77.4 KB Created: 2021-09-13 05:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 93db4e4404e82f97f2d7c0b51f38ccb3 SHA-1: c88e55360c2beebc1fe8c13406f0942dbc7993ad SHA-256: 8b9587c485c52e08911bc90df433a08cfdbd341004c7cd2a59afd32887802092
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://philabc.ru/uplcv?utm_term=samsung+galaxy+usb+drivers+download PDF link annotation
    • https://gencshow.com/upload/ckfinder/files/85084631161.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/48994620109.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/63405483267.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/55597677239.pdfIn PDF document text
    • http://baoveantam.info/upload/files/rinebomoxaxekuwukidapodij.pdfIn PDF document text
    • http://dmkert.hu/files/file/merizeminabigidugixa.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/14974908230.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s3osll3inrmg8s3i3v3cr8nfj2/nonijujoxebiraruwo.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/saxatejodijiwi.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/femamidagodubofa.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/wududojujepaw.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/63532233235.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/19905687739.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/88396251312.pdfIn PDF document text
    • https://highrise.pl/file/42339232511.pdfIn PDF document text
    • http://brukbet.com/user_images/file/nofimitubu.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/fekalupavusizeda.pdfIn PDF document text
    • http://beijingteye.com/upload/files/dudevusumifubosapikebep.pdfIn PDF document text
    • http://lyshiying.com/d/files/vuzirepirutejunik.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/38884050545.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/lidanefebezikita.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_off0000c9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EA 16964 bytes
SHA-256: 27efea47fbb1ebd0c8dc184eb3f909cb8a2ca3d8c030e2b0e44beec0d4fb6151
font_01_sfnt_off0000f64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E62 11176 bytes
SHA-256: e4b87711bb92a4443b871f827bb851f9462544537a0df848e992e5632a436f00

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