Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af5f0decf40bf64…

MALICIOUS

PDF

75.5 KB Created: 2021-09-20 20:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1d8f88f44d1e1c4e7a8b323a799c3f10 SHA-1: ad7c5b4ee555d3ac5f4e94d55a759068a8aac227 SHA-256: 9af5f0decf40bf6419909938a602bd82c7263a87cc090db00cd05da552c91340
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially malicious or unknown domains, suggesting a link farm designed to redirect users to harmful content. The ML classifier strongly indicated maliciousness, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links. While no scripts were extracted, the document's structure and URL distribution are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 4

  • 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 http://sdtr.mdrap.ro/fckeditor/uploads/file/lojav.pdf In PDF document text
    • http://maksimetall.ru/files/27434684148.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/52312474041.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/78480839617.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/16303664687.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/72059340720.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/61993900612.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210912_165836.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/kolufexemoto.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/27037102160.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a353b7a00---pafobowoluvekakebe.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631507535.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16140e90f6cdb9---53410630490.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/1674183181613df03133cfd.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/gemeromonuvaxavatiguke.pdfIn PDF document text
    • https://tkbhanna.com/ckfinder/userfiles/files/tuwamimonamax.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/80199801888.pdfIn PDF document text
    • http://imhang.com/fckeditor/userfiles/image/runemurupewanojevoxiku.pdfIn PDF document text
    • https://theurbanthinktank.com/files/4963152741.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/zonitudojekoxune.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/jufotagulojirili.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/67512339629.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/57902836636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=i+agree+with+you+synonymPDF 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_off0000c414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC414 10760 bytes
SHA-256: 2938a462476a80d6136b75a682f5582a178ee82ca16f05c2d9731d48473f57d4
font_01_sfnt_off0000dcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D0 17084 bytes
SHA-256: bda081c0989bad43caf8e388a0ae5e57de4268be15b790fc8f0a84871db57ec9