Malicious PDF — malware analysis report

Static analysis result for SHA-256 374420df7210a8be…

MALICIOUS

PDF

79.5 KB Created: 2021-09-11 01:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 70851aa911f11f65bdaaf623be145603 SHA-1: 787ef8dfea3e5c43b20951be5e81037d174e8d92 SHA-256: 374420df7210a8bebc975ee1e29e8d10576be6402d19333cee1ea96427372b79
134 Risk Score

Malware Insights

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

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of the numerous external URLs, disguised as a software installer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://garglob.ru/uplcv?utm_term=messenger+lite+2020+apk PDF link annotation
    • http://clevio.biz/fckUpload/file/1263591471.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109021718476429.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/lapeleranisedifofadux.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/62475935789.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/21718605169.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/xeratezizidajijogebidorod.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/dazasizopir.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/papuse.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/53793140859.pdfIn PDF document text
    • http://armanetti.com/images/rodigi.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/xoxawudi.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/53873950759.pdfIn PDF document text
    • http://www.bash.cl/media/file/24021754012.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/jerimevuredagitizero.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/gogevatupozixilisutoza.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/69300431644.pdfIn PDF document text
    • https://debden.org/userfiles/file/In PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://suachuaspa.com/upload/images-content/files/16971052375.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10586954715.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/24583018113.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/gilimisitebofepelipanorap.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/darumetuv.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/vidulegibemuzabudurinago.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_off0000d4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F2 16696 bytes
SHA-256: 040ac8948a4a2e3b92f2fb413b84d9f7975952d67ee133265488838fa04ab5d1
font_01_sfnt_off00010012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10012 10636 bytes
SHA-256: 62c32515101ab8b15c3acf9f0c7578152793894b090ea2b7f915236ab0cb53de
font_02_sfnt_off0001189b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1