Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7bb3da3932bf76…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 13:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: adc547390d58ecf5305b8d5310ac0ba8 SHA-1: 45aba4faaa9b9974527bab103e146fca20d80e64 SHA-256: fa7bb3da3932bf7635d0d50de549e490c822f0e963b958839e90f19636b47188
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within PDF documents. The presence of numerous external links, many pointing to disposable domains, strongly suggests a phishing or malware distribution campaign. ClamAV detection and ML classification further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://architektor.ru/uploads/file/16205620287.pdf In PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/zejixijad.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/zexevejurevawuxudap.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/telafisulajibupozigagane.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/26312845128.pdfIn PDF document text
    • http://contelex.it/userfiles/files/loxizi.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/55777020582.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/78030451362.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/27168438244.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/8777835381.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/7004121196.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/98508283257.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/jeruxoba.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161396b04677db---bijogesabisasomisati.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140636fbebf8---21371986276.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/vepax.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/55045556978.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/nanufewexodaxin.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/19095721335.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/jibotugixudataxu.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/88949441451.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/91868763522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+record+voice+on+android+smartphonePDF link annotation
    • 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_off0000d561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED78 10876 bytes
SHA-256: 152b9277dd2e6fd13a415838682c4c1bdd3d0e0be2190b5f2eaacb49c41168b7
font_02_sfnt_off0001066e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066E 17364 bytes
SHA-256: b48e6e4cb793f0ce32f8387bed507e4643c5428038ee4a47316cd30922d7ce1c

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