Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b26563de04a2555…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 11:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1b37fdd989aeceed3d8b7cbfbd5e9219 SHA-1: 8b33a59e6e401296393d3f137b9a4c213df09223 SHA-256: 8b26563de04a25558b56d67ee8fa786957d0be54a5fa4151ed2a2bf96c740484
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, and the ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://digireg.sk/upload/29998357116.pdf In PDF document text
    • http://liebherr-tr.com/userfiles/file/90464858640.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/motafe.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/daxijasele.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8aca5cf97---fikopoxosakafaviw.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16133e6711d0e9---nivelutija.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/silenibuta.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/lefoxubuzuwarirajiduj.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/temiwefojixitirok.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/pujasoramomomawekixivubij.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/gijaligoxebeza.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/tuzapa.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/70895851469.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/begov.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/69482243307.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-9/20210909203725296319.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/mefopizanudatuzowal.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/tewirusedovo.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/kadesuzojuzisosikana.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/99014619834.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/fifipebub.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/35348377196.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/zinixaposusar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=what+do+chicken+in+minecraft+eatPDF 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_off0000d93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 17364 bytes
SHA-256: 05a3f0e6cfef5274a87f5890bf8af36a08d00ca01c10baac824e1dc51051317c
font_02_sfnt_off00011efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFB 10612 bytes
SHA-256: dbd4a192bc2b31c9d9af18875541bc8444bf208135f8321c4cb5eb5fdc56a634

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