Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd3c5950e83854c…

MALICIOUS

PDF

69.6 KB Created: 2021-09-09 03:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7ac50da81cabff5446a2e087a98ad0b1 SHA-1: 9c7e80f531a39e6f22be933d2b2a44ee3d84e56e SHA-256: 8dd3c5950e83854c0656c066f8f77a1bdac1b5952020f6ac81949770c614d26f
66 Risk Score

Malware Insights

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

The sample is a PDF document flagged by an ML classifier as malicious. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document's purpose is to host many links on disposable hosting, likely to distribute malware or conduct phishing. No scripts were extracted, but the sheer volume of external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://smidgel.ru/uplcv?utm_term=happy+monday+gif+funny PDF link annotation
    • https://egokituz.org/files/galeria/files/luwipefolesat.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/70516837683.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/5754858312.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/45131923679.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/52124979448.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/51331727125.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/zeladaluzaxuvuvetade.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/puboze.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/91221082635.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/dufedotapeziregizizobo.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/simex.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/19453995661.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/gepiru.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/gm69fm2um15l5h3nqb3opl3g33/42821921083.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/xanomukew.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/91415989870.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/6101740725.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/renivux.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/kugikelujoretexulaziwakuv.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/93917427991.pdfIn PDF document text
    • http://erdbau-rauch.at/24511505525.pdfIn PDF document text
    • https://basisnomor.com/contents/files/kagodu.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/jeneruzijosum.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_off0000b1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F3 15556 bytes
SHA-256: 6136eff7de60f0f95ee0113e6ca6b75d085fc28d4e23c014b79e17ef2f3f7389
font_02_sfnt_off0000f16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16F 10504 bytes
SHA-256: 1fc89f6781a9e94fd4ab811f67529a4370bbc31c3fc4cd74f26f3b91b4abd802

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