Malicious PDF — malware analysis report

Static analysis result for SHA-256 35340c0728f0459d…

MALICIOUS

PDF

78.1 KB Created: 2021-09-12 07:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 360a20e1ba498f71e052e47a74efd772 SHA-1: 994b50b6bf8b8c1385e024552e98545121742b14 SHA-256: 35340c0728f0459d86ba5378b16d1efd23efda93b0d725ef4bd5182aa8d1b3d4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to potentially harmful websites. The PDF's structure and the presence of many links suggest it functions as a link farm or a lure for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=built+in+vpn+android PDF link annotation
    • http://kalmi.ru/upfiles/files/dowotupipo.pdfIn PDF document text
    • http://schokobrunnen.com/idata/21586258301.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/3008689518.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/donutufazojorufajabim.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/112199331.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/90991612536.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/19714256497.pdfIn PDF document text
    • https://migger.dk/userimages/file/mafamaxalisaw.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/46563568822.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/99888928936.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/zamijo.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/83242088913.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/19026307524.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/30145278737.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/457h8kl7a3bc2j5jd14ej1m8r0/dagexibejimaperow.pdfIn PDF document text
    • https://securitydm.com/slicice/file/25803665216.pdfIn PDF document text
    • http://ducnhua.com/upload/files/92202551168.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/95404648829.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613255f0c1c8a---riwaxuzotofo.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/87164345200.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/94511773292.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/22726938295.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/zutitigimekewekavojew.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_off0000d2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB06 15900 bytes
SHA-256: f276e962b6b1b4f63c77e0e6d999076136ef9d287bd1a6da683d0faf4571d2d1
font_02_sfnt_off00011423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11423 10304 bytes
SHA-256: 6ce683176bf8678b3cd0cce3b59ce8665624e3d1f39f16707e11f6a3f0c73cb7

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