Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd3373f8f871f31…

MALICIOUS

PDF

95.8 KB Created: 2021-09-22 17:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2fca1d13bc90faa4a888d9b523f18ba7 SHA-1: b7c6a9267d2630cc3ce01b093e5145d3ef0deba4 SHA-256: 3cd3373f8f871f3129b6072ca9d6d5e1624c0d4c1a4fc9b88072d552b69b5656
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these URLs are used to obscure the final malicious destination, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420a6bc2413---bipasepuvaje.pdf In PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/1615235045.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109200035079898.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/fokojosodaf.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/rowixaxaxeduvugul.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/49434895762.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/63711904635.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/37109798659.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/18078281909.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/42047897261.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/89811014302.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/munosikogosowevukive.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/76063872851.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/48070147084.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/lugegajaduzanomufidanib.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/duzirovisuvaweripume.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/jazerimajobuvozepuk.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/74933449016.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/wonemokugiveninozixeg.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109181102443404.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/85117863173.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/vututa.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/kapewivibujuvafulabe.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/gokegukuxufenuk.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/19739200671.pdfIn PDF document text
    • https://renteci.com/imagens/file/vufemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=learn+android+development+from+scratch+freePDF 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_off00010efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12711 10908 bytes
SHA-256: 01a2702a7d1c4734f92304d93971366aceff0cedf095e051f394bbb7146b24d0
font_02_sfnt_off00014017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14017 18484 bytes
SHA-256: fc98613ec6b30342233d7d88d41d4eb5ab6ecd6ceb924251b5ab9513cffdb1e8