Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c391412d1323a2b…

MALICIOUS

PDF

87.1 KB Created: 2021-09-12 21:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2eeb9373214c461c00259470be27c618 SHA-1: d90afcaffcebd6848acdd684c558f972db83ce73 SHA-256: 3c391412d1323a2bb398e6f56715dd1c742d2a9d7df42a40a47cc694fd329fbc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to distribute links. No scripts were extracted, but the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=how+to+turn+off+android+tv+box+without+remote PDF link annotation
    • https://hosvagyok.hu/userfiles/file/75644411104.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/dedax.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/63314765724.pdfIn PDF document text
    • http://kotrackusa.com/fckedit_file/file///20210910_15_3_9.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/75988583821.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/67401385197.pdfIn PDF document text
    • https://led7.ru/file/73683026984.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/sefuwatasabigapo.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/8217830503.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/wisupanenizux.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/91691639459.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/37841741104.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/18356380595.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/10143580993.pdfIn PDF document text
    • http://santabruna.cl/upload/file/vufanawamaxisovuwenorub.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/38906636420.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/xuzobutovajobuwiki.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/rawoxume.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/17116185690.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/52334422265.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/puwafipotozapalewaz.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/23783399253.pdfIn PDF document text
    • http://builderall.info/userfiles/file/bejepasujo.pdfIn PDF document text
    • http://lecostationery.com/files/file/rifuzikatapelisoruku.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/40375028350.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_off0000eea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 10888 bytes
SHA-256: a4efbf02d902052da1ed8f19b22fadf9b2304e5922f8c2e8a3d2ce739c6f9284
font_01_sfnt_off000107a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A2 18184 bytes
SHA-256: ea7fc80959797376b149f6f42357f47637ffd12c7a067ecd14c7f2d584f42510
font_02_sfnt_off00013652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1