Malicious PDF — malware analysis report

Static analysis result for SHA-256 054c5fac850fabd6…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 12:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 98b42dcadba53cdec712d0719e6cba05 SHA-1: 4bbe9a4e9f477c724cb29e5210092ddc775b4836 SHA-256: 054c5fac850fabd691dbf82a2734b9833b458cb30b6e0079e214b082c0878541
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple external URIs and a raw IP address, indicating it is designed to redirect users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'SE_DOWNLOAD_BUTTON' suggest a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=likee+apk+old+version PDF link annotation
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613997c120f41---mavibako.pdfIn PDF document text
    • http://identik.hu/editor_up/50226341203.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/55050148697.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/vowikefagefitaxuvi.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/retilovogegubu.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/43087562214.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/najuwukisapekusuzezat.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/lukeribedefarabimemilaset.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/94326616175.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/rixavenut.pdfIn PDF document text
    • https://kimansion.com/uploads/file/jomametonukafamejupik.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/mazuzoletaxobutekunozen.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/63504413285.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210918_122348.pdfPDF link annotation
    • http://orem.mn/uploads/files/60025817715.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/94808243990.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/48153880424.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/43081672313.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/getinegusoligew.pdfIn PDF document text
    • https://mackbeks.com/files/file/zegedipevop.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/zejuzudelipe.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/323626349.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/guzotejotitovilo.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/fikemuxebowixalutivaxi.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_off0000d231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA43 18472 bytes
SHA-256: 70b27c2091e0d9b6971a75ff91d4ca1913a25ee9ba35a0a5bdedcc9fedf26a63
font_02_sfnt_off000119f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F9 10400 bytes
SHA-256: 91302f7f2ce09aa5ab86a661b50dff45b0768c61da37c9eb3302c1db64d4e8b9