Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f87fdb819032162…

MALICIOUS

PDF

77.5 KB Created: 2021-09-12 11:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 78ceb9ab4728244a47a13bd6525946d4 SHA-1: b5b6a0b497896b13a83e0c03b5ca66cada73f3dd SHA-256: 4f87fdb819032162c49ce9c3143b644249ad91c56a366114ba77ac4855f990fa
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. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to external URLs, as suggested by the PDF_URI and EMBEDDED_URL heuristics, which are often used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://nprofit.hk/userfiles/zisokekedixofewugi.pdf In PDF document text
    • https://eventaipei.com/upload/files/53122075384.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/molinidududa.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/80566004666.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/2f0b0f74a2b9a548a0d383c51e465fcd/xexevixu.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/mofonugivubisixasezo.pdfIn PDF document text
    • http://sdds.be/userfiles/file/pazirisukarafuto.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/23846567989.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/98882176632.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/fefawagetewapila.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/71635528144.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/detupaburup.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f08c6e13cb---pegarebitepupozafe.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/sajozipasigu.pdfIn PDF document text
    • https://edarky.net/data/file/64418263036.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/72743684449.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/49347401721.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/vasajafere.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/loxeferugu.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/21119741521.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/podufodibokilepovubevag.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/19319707861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+you+restart+your+android+phonePDF 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_off0000caa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA4 10732 bytes
SHA-256: a07dd0fd16e7a06f792b0cd2398d195044b2da4c7f232cccb0d7774a5577476d
font_01_sfnt_off0000e346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE346 17448 bytes
SHA-256: d6b0caa27ab6aad5e58ac69644707b9b13339475a02f6f0092315e0792c1be04
font_02_sfnt_off0001107f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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