Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6cfaad56bc217ea…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 18:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fc7dbc5f2f07637e1a18088ba9141a73 SHA-1: 136814420d1a800e8df36324bc98f433fb6f604b SHA-256: b6cfaad56bc217ea8853552b4375e8385ae61ebbd70cee88457bbce3d6dc22ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=nba+2k20+android+apk PDF link annotation
    • http://cen7dias.es/userfiles/files/79831056940.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132038dcccd8---mavakegijogasitik.pdfIn PDF document text
    • http://lecostationery.com/files/file/83221940893.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/dupakogenifig.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/xapegubogajivi.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/kugewujamejusuxegaw.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/tosegeneruloli.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/zuwewofo.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/vojavatifumiwovebifo.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/dimusoxexopamowamome.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/pilowiziviremi.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/55866021160.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/setusifo.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/zogiwamosakebes.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/76950216578.pdfIn PDF document text
    • https://hoavily.com/uploads/files/ruxuwezodufu.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/tokufogilobisixuwuworejok.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210915_223232.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/68433755195.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/ruzibopisi.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/koqjrj31k5b0d9fhnmapa564l4/fiduraxurixepun.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC349 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5
font_01_sfnt_off0000d928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD928 20760 bytes
SHA-256: c591ad5e52c991b989753988496332e723bc7d304277763c76c8f76e88115d8a
font_02_sfnt_off00010f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12772 10392 bytes
SHA-256: 43d20e10116545bee275c6c8768026c49ec713e050f7972e15a0ce4309e8d1a4

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