Malicious PDF — malware analysis report

Static analysis result for SHA-256 56bf81543144aa01…

MALICIOUS

PDF

85.4 KB Created: 2021-09-19 18:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ee21479ae4595c2098aec74074c3d090 SHA-1: 105a9531eaa7f66460ea320dd37d5f619d46c561 SHA-256: 56bf81543144aa01f090bd8ad11f003fe04807606a5c6469792f47f770a4a87c
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 documents. It also hosts a large number of external URLs, many of which appear to be part of a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://nomylo.ru/uplcv?utm_term=the+real+l+word+streaming+free PDF link annotation
    • http://qbcar.ru/ckfinder/userfiles/files/kijinepuzumiwupivegirok.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/febaretovamebatubekeb.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/60413109975.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/65736916255.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/1696822847.pdfIn PDF document text
    • https://pepsima.biz/files/file/18866557111.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/26637142996.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/wikikezapojisa.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/70481056544.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/kefoxibebuzenekugem.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/82636227452.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/38478788305.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/40134354618.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/vejewatopukujubaxidalinow.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/batojabijeliro.pdfIn PDF document text
    • http://7profi.net/userfiles/file/jolibodesulejojisosufi.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143790c10b21---43192997496.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/80472647859.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7c2d660de55f72c8feb5d901bc7354d4/37765440585.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/witigesazas.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/46366382203.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/xotufesemaz.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/potapatuvafewati.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/lipubisazuriledaj.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/30539343564.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/pabowusesokuzilikonub.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_off0000e50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50B 10852 bytes
SHA-256: 5b2c974d852a20437bf830586bcbe0912795c5c17cf2f9dc92d56b8525dca2b6
font_01_sfnt_off0000fdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D9 19012 bytes
SHA-256: f3b0ca82336d265b4150aa1c1cf4366dbb8218a7f9262837d6307991935b354b