Malicious PDF — malware analysis report

Static analysis result for SHA-256 8183cf137fa1dee7…

MALICIOUS

PDF

74.0 KB Created: 2021-09-23 22:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b12bbd0bd7802376295baa0e950cd03 SHA-1: cc4b257a447de23b029695411bf2448bbde4908b SHA-256: 8183cf137fa1dee7ffd37abc42e446c03284be89469061da97fb2a3f334df172
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URIs, one of which points to a raw IP address, indicating a potential exploit or redirection to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of a link farm heuristic further supports a malicious campaign aiming to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://medicentrumnz.eu/medicentrum/files/file/81362962512.pdf In PDF document text
    • http://toanlinh.vn/upload/files/8840954462.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/gijimexetazire.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/jagifazovulebidituruxo.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/87714210222.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/44228032634.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/gedewusitusonefito.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/09101027739.pdfIn PDF document text
    • https://invision.buzyhub.com/files/26657363510.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46192318649.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/ruparitupibarinonugukufi.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/wovomekogojeliwazami.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/53943976648.pdfIn PDF document text
    • http://lactopad.com/uploads/files/tosaninonimajezejimod.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/96089945030.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/narezowuwokanuguz.pdfIn PDF document text
    • https://yasacompany.com/upload/files/pogotenigadikanevibewux.pdfIn PDF document text
    • https://camelcarpet.org/d/files/givopoz.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/munolevawarele.pdfIn PDF document text
    • https://doitoutdoorz.com/file/v6fcKPJQBFhS41XV.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/94542206596.pdfPDF link annotation
    • https://deshpanday.com/ckfinder/userfiles/files/88534118271.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/nomijafolubexafamewo.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109011411048253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=gta+vice+city+stories+apkPDF 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_off0000bbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB2 10528 bytes
SHA-256: 48ce3fdc934f944a36ee3ef7eb372e848f275ea164abbefad11010813df17fa5
font_01_sfnt_off0000d3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3ED 17728 bytes
SHA-256: d00d0c8f5ffd1c3dececd72d393f26880dd7a4c1248388109c1ff9e1ee1ab3fa
font_02_sfnt_off00010209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10209 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1