Malicious PDF — malware analysis report

Static analysis result for SHA-256 4002ee0f16d0fc19…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 02:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e49f69592c61a1921f723922a591f67b SHA-1: e5b0f04cf4d83753258c74037a91b80e49a5b364 SHA-256: 4002ee0f16d0fc19d095a085c809e50deaceff4f0e7a8f544424ae5c1010e8b9
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to external domains, many of which are structured as link farms or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links on potentially untrustworthy domains. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest an intent to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=xiaomi+note+9+antutu+benchmark PDF link annotation
    • https://sealand-pptc.com/userfiles/file/loruxevotamolaf.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/17552953012.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/60923776914.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/29808236344.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/vanirofenopitabilajufupep.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/9861679346.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea8ecb94d---sebirogisupel.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/99625060399.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/legivusixokasurabozovas.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/pikusabojuzi.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/2662909277.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/4302804113.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/xagedizusolawobev.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/wixamomagafagelexe.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/62895428677.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/57073382506.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/81636060302.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/3989235333.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/batowageguved.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/67871260818.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/31064247349.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161451cf7892cb---tazoguximuvejepas.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/40810254136.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/vuvezumejebanepepoxozuviw.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_off0000d0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B6 22012 bytes
SHA-256: bc5721c72dbfeb3d04a15b4c2672faebf3e1045330214c07d9a4c4e2ce28a889
font_01_sfnt_off00010ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD7 10788 bytes
SHA-256: 39d3b16882a0b07dd0298f66066c0787752b491200d7bd02ef18133f02dd5d74
font_02_sfnt_off00012384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12384 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1