Malicious PDF — malware analysis report

Static analysis result for SHA-256 3130272ad98194f5…

MALICIOUS

PDF

77.2 KB Created: 2021-09-19 18:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 90b159afb118d8a29ccdf17970b32315 SHA-1: 5b9a4f46fafab24dac14f3d3969e104a3e2f3714 SHA-256: 3130272ad98194f5fd97de5a2c0220285d8889d97183d03cf5be31a01710a19c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=how+to+lock+file+manager+in+android PDF link annotation
    • https://kalitelivideoizle.com/resimler/files/53938263843.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/pusefubazowote.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/bagukagunidadelud.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/26787747401.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/godusunegepimikofo.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ebdbce000---jimexaresotefowikevololor.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/zejiduduri.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/25161069292.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/koxenuzelexivegaleposuvib.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/lomepuruvura.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/xazixuloxe.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/26413371773.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/gegenewegaxapumide.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/30260618340.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/lomapewonagovuvudusimaf.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/881199317.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/metefavajonur.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/86565922081.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/1849904668.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/nuzatabimarijefojuj.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bf15d46b0---66392384882.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/44175593897.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/vupawadisobusetutadal.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_off0000ca19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA19 17128 bytes
SHA-256: 8a8e7dfbf2a56fa14bf378a017a41d38fec9e328de9536cc9ef2650d8efef436
font_01_sfnt_off0000f65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E76 10820 bytes
SHA-256: c9571a886e049bc8f685cc2cafbf57656c363305ede372bca4fcbb4aa9e68e10

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